Chapter LXXXIII: Section 29 (3)

See (in this volume)
UNITED STATES OF AMERICA: A. D. 1898 (APRIL-MAY: CUBA).

SAMPSON, Rear-Admiral William T.:
Operations at Santiago de Cuba.
See (in this volume)
UNITED STATES OF AMERICA: A. D. 1898 (APRIL-JUNE).

SAMPSON, Rear-Admiral William T.:
Destruction of Spanish squadron.

See (in this volume)
UNITED STATES OF AMERICA: A. D. 1898 (JULY 3).

SAN DOMINGO.

See (in this volume)
DOMINICAN REPUBLIC.

SAN FRANCISCO: A. D. 1898.
New city charter.

A city charter of a quite new and experimental character was
adopted by popular vote in May, to go into effect at the
beginning of the year 1900. Its main features were described
at the time by the "New York Tribune," as follows:

"The formation of this charter is an advanced example of the
exercise of municipal home rule. The constitution of
California gives the cities of the state the uncommon
privilege of framing their own charters subject simply to the
veto power of the legislature. Exercising that right, the
people, acting through fifteen free-holders, elected for that
purpose, have drawn up the new charter. … If the legislature
approves, it will become the local constitution. The charter
provides for its own amendment by the people without appeal to
the legislature. So the present provisions of that instrument
may be only a form to be entirely remodeled by the city at its
own pleasure until it has no resemblance to the laws to which the
state authorities gave approval. That is an extreme delegation
of powers, such as we think has never before been made in an
American state. The mayor has large powers of appointment and
removal. He can suspend all elected officers except the
supervisors—the city legislators—who may remove those whom he
suspends, and he may remove at any time for cause all
appointive officers. The elective list is large, for, though
there are only eighteen supervisors, the number of places
filled by election each year is thirty. This is a great
departure from the charter-making practice recently prevalent,
which has tended to the election of only a few administrative
officers who are responsible for the selection of agents in
different departments. Attempt is made to centre
responsibility in the mayor, but the supervisors and the
people both can pass ordinances likely to interfere with that
responsibility. So the charter is as far as possible from
inaugurating the one-man power, which has been much advocated
as the cure for the ills which spring from a municipal
administration animated by no uniform purpose or
intelligence."

SAN JUAN HILL, Battle of.

See (in this volume)
UNITED STATES OF AMERICA: A. D. 1898 (JUNE-JULY).

SAND RIVER CONVENTION, The.

See (in this volume)
SOUTH AFRICA (THE TRANSVAAL): A. D. 1884-1894.

SANTIAGO DE CUBA: A. D. 1898(May-June).
Blockade of Spanish squadron in the Bay.

See (in this volume)
UNITED STATES OF AMERICA: A. D. 1898 (APRIL-JUNE).

SANTIAGO DE CUBA: A. D. 1898 (June-July).
Attack and investment by American army.

See (in this volume)
UNITED STATES OF AMERICA: A. D. 1898 (JUNE-JULY).

SANTIAGO DE CUBA: A. D. 1898 (July 3).
Destruction of Spanish fleet.

See UNITED STATES OF AMERICA:
UNITED STATES OF AMERICA: A. D. 1898 (JULY 3).

SANTIAGO DE CUBA: A. D. 1898 (July 4-17).
Surrender of the city and Spanish forces.

See (in this volume)
UNITED STATES OF AMERICA: A. D. 1898 (JULY 4-17).

SANTIAGO DE CUBA: A. D. 1898 (August).
Sickness in the American army.
Withdrawal of troops.

See (in this volume)
UNITED STATES OF AMERICA:
A. D. 1898 (JULY-AUGUST: CUBA).

SARGON OF AKKAD.

See (in this volume)
ARCHÆOLOGICAL RESEARCH: BABYLONIA: AMERICAN EXPLORATION.

SAYINGS OF OUR LORD, Discovery of a fragment of the.

See (in this volume)
ARCHÆOLOGICAL RESEARCH: EGYPT: DISCOVERY OF A FRAGMENT.

SCHLEY, Admiral W. S.:
In operations at Santiago de Cuba.

See (in this volume)
UNITED STATES OF AMERICA: A. D. 1898 (APRIL-JUNE).

SCHLEY, Admiral W. S.:
Destruction of Spanish squadron.

See (in this volume)
UNITED STATES OF AMERICA: A. D. 1898 (JULY 3).

SCHOOLS.

See EDUCATION.

SCHREINER, W. P.:
Resignation of the Premiership of Cape Colony.

See (in this volume)
SOUTH AFRICA (CAPE COLONY): A. D. 1900 (APRIL-JUNE).

SCHWAN, General:
Military operations in the Philippine Islands.

See (in this volume)
PHILIPPINE ISLANDS: A. D. 1899 (JANUARY-NOVEMBER).

{435}

----------SCIENCE, RECENT: Start--------

NOTABLE ACHIEVEMENTS.

ARCHÆOLOGICAL DISCOVERY.

See (in this volume)
ARCHÆOLOGICAL RESEARCH.

CHEMISTRY AND PHYSICS:
Acetylene Gas.

Acetylene gas has been known since 1832, when it was
discovered by Edmund Davy; but it remained a mere laboratory
product until 1892, when two experimenters, in America and
France, stumbled accidentally on the production, in an
electric furnace, of calcium carbide, which water decomposes,
readily yielding the gas in question. The American discoverer
was Mr. Thomas Willson, a Canadian electrician, residing at
Spray, North Carolina; his French rival was Professor Henry
Moisson, of Paris. The priority of Mr. Willson in the
discovery, or in the announcement of it, is most generally
recognized, and he secured patents in the United States and
elsewhere. Electrical developments since 1892 have economized
the manufacture of calcium carbide, by electric heat acting on
a mixture of lime and coke, and it has become an important
commercial product, at Niagara Falls and other seats of
electric power, bringing acetylene gas into extensive use as
an illuminant. There have been dangers and difficulties in the
use, however, not easily overcome.

CHEMISTRY AND PHYSICS:
Discovery of Argon and Helium.

"After Lord Rayleigh, in 1892, had proved that nitrogen
obtained from chemical combinations was about one-half per
cent lighter than that obtained from the atmosphere, a
determination that was again verified in 1894, Lord Rayleigh
and Professor Ramsay separated from atmospheric nitrogen an
elementary gas of great density which, by reason of its
chemical indifference, they called argon. They proved that
this gas formed about 0.8 or 0.9 per cent of the volume of
nitrogen, from which it could be separated either by
incandescent magnesium or by the continued action of the
electric spark. It was established beyond doubt that Cavendish
produced this gas a hundred years ago by the use of the
electric spark. Argon, either alone or accompanied by helium,
has also been found in natural waters as well as in minerals.
Its discovery in a meteorite of Augusta County, Virginia,
United States of America, may perhaps lead us to ascribe to it
an extra-terrestrial origin.

"The physical properties of argon are very distinct, and its
characteristic spectrum enables us to at once distinguish it
with certainty from any other substance, but from a chemical
point of view this gas is most extraordinarily inactive, and
we have not yet succeeded in making it form combinations as
the other elements do. This peculiarity, and also the
impossibility of finding a place in the periodic system for a
simple body having the molecular weight of argon (39.88), have
given rise to all sorts of hypotheses relative to the nature
of this gas. …

"Another most interesting discovery was that of helium, made
by Professor Ramsay. In 1891 Hillebrand showed that uranium
ore and ores of the same family when dissolved in acids or
fused with alkaline carbonates, or even merely heated in a
vacuum, may give off as much as 3 per cent of nitrogen.
Professor Ramsay obtained this gas from cleveite and by means
of spectroscopic examination demonstrated the presence of
argon; and in the course of his experiments—in March, 1895—he
observed beside the spectrum of argon another bright, yellow
line that did not belong to that spectrum, and which Crookes
recognized as identical with the line D that Lockyer had
already observed in 1868 in the spectrum of the solar
chromosphere, and which he had attributed to an element as yet
unknown upon the earth—helium. The same line had also been
distinguished in the spectra of other fixed stars,
particularly in the spectrum of Orion, so that it may be
admitted that helium exists in large quantities
extra-terrestrially. … On our planet it appears, on the
contrary, to be very rare, and may be ranked among the rarest
of elements. … "Helium is the lightest of all the gases except
hydrogen; Stoney deduces from this fact an explanation of the
existence of these two elements in but very small quantities
in a free state upon the face of the earth, while they are
distributed in enormous masses throughout the universe. The
comparatively small force of the earth's gravitation does not
form a sufficient counterpoise to the velocity of their
molecules, which therefore escape from the terrestrial
atmosphere unless restrained by chemical combination. They
then proceed to reunite around great centres of attraction,
such as the fixed stars, in whose atmospheres these elements
exist in large quantities."

_C. Winkler,
The Discovery of new Elements within the last
twenty-five years
(Annual Report of Smithsonian Institution, 1897,
page 237, translated from Revue Scientifique,
4th series, volume 8)._

CHEMISTRY AND PHYSICS:
Liquefaction of Oxygen, Hydrogen and Air.

"The most remarkable recent work in refrigeration is that of
Professor James Dewar, of the Royal Institution in London. The
feat of liquefying oxygen by a succession of approaches to its
critical temperature has been thus described by him, in an
interview which appeared in 'McClure's Magazine,' November,
1893: 'The process of liquefying oxygen, briefly speaking, is
this: Into the outer chamber of that double compressor I
introduce, through a pipe, liquid nitrous oxide gas, under a
pressure of about 1,400 pounds to the square inch. I then
allow it to evaporate rapidly, and thus obtain a temperature
around the inner chamber of -90° C. Into this cooled inner
chamber I introduce liquid ethylene, which is a gas at
ordinary temperatures, under a pressure of 1,800 pounds to
the square inch. When the inner chamber is full of ethylene,
its rapid evaporation under exhaustion reduces the temperature
to -135° C. Running through this inner chamber is a tube
containing oxygen gas under a pressure of 750 pounds to the
square inch. The critical point of oxygen gas—that is, the
point above which no amount of pressure will reduce it to a
liquid—is—115° C., but this pressure, at the temperature of
-145° C., is amply sufficient to cause it to liquefy rapidly.'

{436}

"In May, 1898, Professor Dewar, by the use of liquid oxygen,
succeeded in liquefying hydrogen, producing a liquid having
but one-fourteenth the specific gravity of water; this exploit
brought him within 21° of the absolute zero of centigrade. He
afterward reduced the liquid to solid form, attaining a
temperature estimated at four to five degrees lower. Faraday
and other investigators of an earlier day surmised that
hydrogen, when solidified, would prove to be a metal; now that
the feat of solidification has been accomplished, hydrogen
astonishes the physicist by displaying itself as non-metallic.
…

"For some years the plan was to employ a series of chemical
compounds, each with a lower boiling-point than its
predecessor in the process, and all troublesome and hazardous
in manipulation. A better method has been developed by keeping
to simple air from first to last, as in the apparatus of Dr.
Linde, of Dr. Hampson, and of Mr. Charles E. Tripler.

"As the Tripler machine does its work on a bolder scale than
either of the others, let its operation be briefly outlined:
Air is first compressed to 65 pounds pressure to the square
inch; through a second pump this pressure is exalted to 400
pounds, and with a third pump the pressure is carried to 2,500
pounds. After each compression the air flows through jacketed
pipes, where it is cooled by a stream of water. At the third
condensation a valve, the secret of whose construction Mr.
Tripler keeps to himself, permits part of the compressed air
to flow into a pipe surrounding the tube through which the
remainder is flowing. This act of expansion severely chills
the imprisoned air, which at last discharges itself in liquid
form—much as water does from an ordinary city faucet."

_G. Iles,
Flame, Electricity and the Camera,
chapter 6 (New York: Doubleday, Page & Co.)._

CHEMISTRY AND PHYSICS:
Smokeless Powders.

"In recent years smokeless powders have largely superseded all
others. These contain usually nitro-cellulose (gun cotton), or
nitro-glycerine, or both, made up into a plastic, coherent,
and homogeneous compound of a gluey nature, and fashioned into
horn-like sticks or rods by being forced under pressure,
through a die plate having small holes, through which the
plastic material is strained into strings like macaroni, or
else is molded into tablets, pellets, or grains of cubical
shape. Prominent among those who have contributed to this art
are the names of Turpin, Abel and Dewar, Nobel, Maxim, Munroe,
Du Pont, Bernadou and others. In the recent years of the
Nineteenth Century great activity has been manifest in this
field of invention. In the United States more than 600
different patents have been granted for explosives, the larger
portion of them being for nitro-compounds which partake in a
greater or less degree of the qualities of gun cotton or
nitro-glycerine."

_E. W. Byrn,
Progress of Invention in the 19th Century,
page 419._

CHEMISTRY AND PHYSICS:
X Rays.
The Discovery of Professor Rontgen.

"Fresh proofs await us of the supreme rank of both electricity
and photography as resources of art and science as we observe
the transcendent powers evoked by their union. From this union
no issue is more extraordinary, more weighty with meaning and
promise, than the X-ray pictures due to Professor Wilhelm
Konrad Rontgen. In these pictures he has but crowned labours
which began when Sir John Herschel noticed that a peculiar
blue light was diffused from a perfectly colourless solution
of quinine sulphate. Professor (now Sir) George Stokes
explained the phenomenon by showing that this blue light
consists of vibrations originally too rapid to be visible,
which are slowed down within the limits of perceptibility as
they pass through the liquid. …

"One path of approach to the achievement of Professor Röntgen
was opened by Sir John Herschel; another, as important, was
blazed and broadened by Professor (now Sir) William Crookes.
In 1874 and 1875 he was engaged upon the researches which gave
the world the radiometer, the tiny mill whose vanes rotate
with rays of light or heat. The action of this mill depends
upon its being placed in a glass bulb almost vacuous. When
such a bulb incloses rubies, bits of phenakite, or other
suitable objects, and electrical discharges are directed upon
them, they glow with the most brilliant luminescence known to
art. Excited by a cathode ray, that is, a ray from the
negative pole of an electrical machine, a Crookes bulb itself
shines with a vivid golden green ray which reminds the
onlooker of the fluorescence of earlier experiments. … "Year
by year the list of substances excitable to luminosity in a
Crookes bulb has been lengthened, and in 1894 it was the good
fortune of Professor Philipp Lenard to discover a wonderful
power of such a bulb. Emerging from it was a cathode ray which
passed nearly as freely through a thin plate of aluminium as
common sunshine does through a pane of glass. Hertz had, a few
years previously, discovered that metals in very thin sheets
were virtually transparent (or, to use Mr. Hyndman's term,
transradiable) to his electric waves. This property was found
by Professor Lenard to extend to the cathode ray and in a much
higher degree. … The ultra-violet ray of ordinary light has
the singular power of causing the gases which it may traverse
to become conductors of electricity, with the effect of
discharging an electrified metallic plate; this property is
shared by cathode rays. Associated with them are the rays of
still more extraordinary powers, discovered by Professor
Röntgen. In his own words let his achievement be recounted, as
published in 'McClure's Magazine,' April, 1896.

"'I have been for a long time interested in the problem of the
cathode rays from a vacuum tube as studied by Hertz and
Lenard. I had followed their and other researches with great
interest, and determined, us soon as I had the time, to make
some researches of my own. This time I found at the close of
last October. I had been at work for some days when I
discovered something new.' 'What was the date?' 'The 8th of
November.' 'And what was the discovery?' 'I was working with a
Crookes tube covered by a shield of black cardboard. A piece
of barium platino-cyanide paper lay on the bench there. I had
been passing a current through the tube, and I noticed a
peculiar black line across the paper.' 'What of that?' 'The
effect was one which could only be produced, in ordinary
parlance, by the passage of light. No light could come from
the tube, because the shield which covered it was impervious
to any light known, even that of the electric arc.' 'And what
did you think?' 'I did not think; I investigated. I assumed
that the effect must have come from the tube, since its
character indicated that it could come from nowhere else. I
tested it. In a few minutes there was no doubt about it. Rays
were coming from the tube which had a luminescent effect upon
the paper.
{437}
I tried it successfully at greater and greater distances, even
at two metres. It seemed at first a new kind of invisible
light. It was clearly something new, something unrecorded.'
'Is it light?' 'No.' 'Is it electricity?' 'Not in any known
form.' 'What is it?' 'I don't know.' And the discoverer of the
X rays thus stated as calmly his ignorance of their essence as
has everybody else who has written on the phenomena thus far.

"'Having discovered the existence of a new kind of rays, I of
course began to investigate what they would do.' He took up a
series of cabinet-sized photographs. 'It soon appeared from
tests that the rays had penetrative power to a degree hitherto
unknown. They penetrated paper, wood, and cloth with ease; and
the thickness of the substance made no perceptible difference,
within reasonable limits.' He showed photographs of a box of
laboratory weights of platinum, aluminium, and brass, they and
the brass hinges all having been photographed from a closed
box, without any indication of the box. Also a photograph of a
coil of fine wire, wound on a wooden spool, the wire having
been photographed and the wood omitted.

"'The rays,' he continued, 'passed through all the metals
tested, with a facility varying, roughly speaking, with the
density of the metal. These phenomena I have discussed
carefully in my report to the Würzburg Society, and you will
find all the technical results therein stated.' He showed a
photograph of a small sheet of zinc. This was composed of
smaller plates soldered laterally with solders of different
metallic proportions. The differing lines of shadow caused by
the difference in the solders were visible evidence that a new
means of detecting flaws and chemical variations in metals had
been found. A photograph of a compass showed the needle and
dial taken through the closed brass cover. The markings of the
dial were in red metallic paint, and thus interfered with the
rays, and were reproduced. 'Since the rays had this great
penetrative power, it seemed natural that they should
penetrate flesh, and so it proved in photographing the hand,
as I showed you.'" …

"Provided with a Röntgen bulb, the photographer passes from
the exterior to the interior of an object, almost as if he
were a sorcerer with power to transmute all things to glass.
Equipped with a simple X-ray apparatus, dislocations and
fractures are detected by the surgeon, diseases of bones are
studied, and shot, needles, and bits of glass or corroding
wire within the muscles of a patient are located with
exactitude. Thanks to the work of Mr. Mackenzie Davidson, the
like detection of renal calculi can be looked forward to with
a fair degree of certainty. The same means of exploration
offers equal aid to medicine: it demonstrates the
calcification of arteries, and aneurysms of the heart or of
the first part of the aorta; with improved methods it may be
possible to study fatty degenerations of the arteries and
larger blood-vessels. Dr. C. M. Mouillin, addressing the
Röntgen Society of London as its president, states that the
fluorescent screen has now reached such a degree of perfection
that the minutest movement of the heart and lungs, and the
least change in the action of the diaphragm, can be watched
and studied at leisure in the living subject. He considers it
probable that the examination of a patient's chest with this
screen may become as much a matter of common routine as with
the stethoscope to-day. …

"Manifestly, the unseen universe which enfolds us is steadily
being brought to the light of day. The investigations of Hertz
established that the light-waves which affect the eye are but
one octave in a gamut which sweeps indefinitely far both above
and below them. In his hands, as in those of Joseph Henry long
before, electric waves found their way through the walls and
floors of a house; in the Marconi telegraph these waves pass
through the earth or a fog, a mist or a rain-storm, with
little or no hindrance. What does all this mean? Nothing less
than that, given its accordant ray, any substance whatever is
permeable, and that, therefore, to communicate between any two
places in the universe is simply a question of providing the
right means."

_G. Iles,
Flame, Electricity and the Camera,
chapter 24 (New York: Doubleday, Page & Co.)._

In an article made public in the "New York Tribune" of January
6, 1901, Professor John Trowbridge, of Harvard University,
expressed his anticipations from the further improvement of
the use of the X rays, as follows: "At present all of the
great hospitals of the world examine injuries of the
extremities of the human body by means of these rays. In some
cases the thicker portions of the body can be studied by their
means. There is, however, much to be desired in the method,
for in general the rays exhibit only the shadows of the bones
of the extremities, or reveal at most the regions of greatest
density in the body. If the muscles and tendons or the veins
and arteries could be studied by means of these rays, an
immense aid to surgery would result. Some experiments I have
conducted with currents of great strength, lead me to believe
that much can be done in this direction, for I have in certain
cases obtained unmistakable traces of muscles and tendons, and
the direction in which to advance is becoming clearer. The use
of the X rays is not confined to the examination of the body.
Together with the ultra violet rays, the X rays are used to
cure cutaneous disorders. We are realizing that electricity is
an important factor in health and disease. The investigations
which have resulted from the discovery of these rays have
opened wide vistas in the molecular world."

ELECTRICAL SCIENCE:
Power.
Lighting.
Electro-chemical and Electro-metallurgical works.
The development at Niagara Falls.

"There were perhaps not more than twenty trolley cars in
actual service in 1887, and these were of doubtful success.
There were no regularly constituted electric railways worthy
of the name. The telephone and electric-lighting wires were
largely overhead, and frequently the construction was of the
most imperfect and temporary character. … Within the past
eight or ten years much has been done in the perfection of
thoroughly practical forms of meters and other instruments for
the measurement of electric forces and quantities. While such
work resembles in its delicacy that demanded by watch
mechanism, on the other hand the large station dynamos are
examples of the heaviest machine construction. … A few years
ago a dynamo was large if it demanded 100 or 200 horsepower to
drive it, while now such machines are diminutive when compared
with those of 2,000 horsepower commonly constructed.
{438}
Dynamos are in use at Niagara of 5,000 horsepower capacity. A
single one of these would supply more than 50,000 incandescent
lights such as are ordinarily used, or would give motion to
500 trolley cars. The period since 1887 has been marked by
great extension in electric lighting by both arc and
incandescent lamps. … One of the chief factors in this great
extension has been the application of alternating electric
currents, or currents of wave-like nature, reversing their
direction many times in each second. The direct or continuous
current had previously occupied the field alone. But the
alternating current possessed the advantage of readily
permitting the sending out over a long distance of a high
pressure current with but little loss and by means of
comparatively small and inexpensive lines. This current,
relatively dangerous, could then be exchanged for a safe
low-pressure current on the house mains for working the
lights. The device which makes the exchange is called a
transformer. It is in reality a modified induction coil—a
simple structure of copper wire, sheet-iron, and insulating
materials, with no moving parts to need attention or to get
out of order. The properties and use of the transformer in an
alternating-current system were comparatively unknown before
1887, but since that time it has played a part in electric
development the importance of which cannot easily [not?] be
overestimated. It has been, furthermore, brought to a high
degree of perfection by the persistent and painstaking effort
of numerous workers. In transforming a current of high
pressure to one of lower pressure, or the reverse, only a very
slight loss of power or energy is suffered. On a large scale,
this loss is barely 3 per cent of the energy of the
transformed current. The larger sizes of transformers now in
use have capacities equivalent to considerably over 1,000
horsepower. Some of these structures are employed at Niagara
and others at Buffalo. As in the case of the apparatus just
mentioned, the effort spent in the perfection of the huge
dynamo-electric generators used in lighting and power stations
has resulted in machines so perfect as to leave but little
chance of further increase of effectiveness. They waste only a
small percentage in converting mechanical power into
electrical energy, and run for years with but little attention
or need of repairs. Along with all this improvement has gone a
like betterment in the thousand and one details and minor
devices which go to make up an electric system. …

"Perhaps … no better example of the varied application of
electric energy exists than at Niagara. Certainly no grander
exemplification of the way in which electric forces may be
called into play, to replace other and unlike agencies, can be
cited. Here at Niagara we may forcibly realize the importance
of cheap and unfailing power developed from water in its fall.
We find the power of huge water wheels delivered to the
massive dynamos for giving out electric energy. This energy is
variously employed. The electric lighting of the city of
Niagara and surroundings and the electric railways naturally
depend upon the water power. Besides these, which may be
termed the ordinary applications of electricity, there are
clustered at Niagara a number of unique industrial
establishments, the importance of which will undoubtedly
increase rapidly. In the carborundum factory we find huge
furnaces heated by the passage of electric current, and
attaining temperatures far beyond those of the ordinary
combustion of fuel. These electric furnaces produce
carborundum, a new abrasive nearly as hard as the diamond,
which is a combination of carbon and silicon, unknown before
the electric furnace gave it birth. Sand and coke are the raw
substances for its production, and these are acted upon by the
excessively high heat necessary to form the new product,
already in extensive use for grinding hard materials. The
metal aluminum, which not many years ago cost $2 an ounce, is
now produced on a large scale at Niagara, and sold at a price
which makes it, bulk for bulk, cheaper than brass. Here,
again, electricity is the agent; but in this case its power of
electrolyzing or breaking up strong chemical unions is
employed. … Works for the production of metallic sodium and
other metals similarly depend upon the decompositions effected
by the electric current. Solutions of ordinary salt or brine
are electrolyzed on a large scale in extensive works
established for the purpose. … The very high temperature which
exists in an electric arc, or between the carbons of an arc lamp,
has in recent years found application in the manufacture of
another important compound, which was formerly but slightly
known as a chemical difficult to prepare. Carbide of calcium
is the compound referred to, and large works for its
production exist at Niagara. Here again, as in the carborundum
works, raw materials of the simplest and cheapest kind are
acted upon in what may be termed an electric-arc furnace.
Coke, or carbon, and lime are mixed and charged into a furnace
in which an enormous electric arc is kept going. … The
importance of carbide of calcium rests in the fact that, by
contact with water, it produces acetylene gas. The
illuminating power of this gas, when burned, is its remarkable
property.

"It will be seen that the metallurgical and chemical
developments at Niagara are the direct outgrowth of electrical
utilization of water power. With many water powers, however,
the outlet for the application of the electrical energy exists
many miles away from the place at which the water power is
found. Even at Niagara there is an example of the beginning of
long-distance transmission, by a high-pressure line extending to
Buffalo and delivering electric energy to an electric station
there. In this case 'step-up' transformers, as they are
called, are employed at the Niagara power plant to step up or
raise the electrical pressure or potential from that given by
the dynamos to that required for the transmission to Buffalo.
This transformation is from about 2,500 up to 10,000 volts. At
the Buffalo end the reverse process is carried on by 'step-down'
transformers, and the energy is delivered to the trolley lines
at about 500 volts. … The whole Niagara plant has grown into
existence within the past five years, and as a consequence of
the technical advances within the period of the past ten
years. There are, however, in active operation, besides the
Niagara power plant, several other water-power transmissions,
some of them far exceeding in distance that between Niagara
and Buffalo, and some in which the amount of power conveyed,
as well as the pressure of the current used upon the line, is
much greater than is yet to be found at Niagara. … No limit
can as yet be definitely set as to the distance which can be
covered in an electrical transmission. … It may be said that
at present the range of distances is between 30 and 100 miles.
…

{439}

"Electricity seems destined at no distant day to play an
important part in revolutionizing passenger traffic between
large centers of population. The facility with which electric
service may be superposed on ordinary steam roads will greatly
further this development. The work with the third-rail system,
undertaken by one of our prominent railway organizations, has
abundantly demonstrated the practicability of such
superposition. The future will witness the growing
substitution of either single motor cars or two or three
coupled cars for long, heavy trains drawn by locomotives, and
a more frequent service will result. There is an eventual
possibility of higher average speeds, since stops will not
consume much time, and the time required to recover the speed
after a stop will be much less than at present. … The heating
power of the electric current is now utilized in a variety of
ways. Electric welding machinery has been put into service
either for accomplishing results which were not possible to be
obtained before its development, or to improve the work and
lessen the cost."

_Elihu Thomson,
Electrical Advance in Ten Years
(Forum, January, 1898)._

ELECTRICAL SCIENCE:
Development of Power at Niagara Falls.

The following description of the engineering work by which
Niagara was harnessed to turbines and dynamos, for an enormous
development of electrical power, is taken from a paper read by
Mr. Thomas Commerford Martin, of New York, at a meeting of the
Royal Institution of Great Britain, June 19, 1896, and printed
in the Proceedings of the Institution, Volume 15; reprinted in
the Annual Report of the Smithsonian Institution, 1896, page
223:

"Niagara is the point at which are discharged, through two
narrowing precipitous channels only 3,800 feet wide and 160
feet high, the contents of 6,000 cubic miles of water, with a
reservoir area of 90,000 square miles, draining 300,000 square
miles of territory. The ordinary overspill of this Atlantic
set on edge has been determined to be equal to about 75,000
cubic feet per second, and the quantity passing is estimated
as high as 100,000,000 tons of water per hour. The drifting of
a ship over the Horse Shoe Fall has proved it to have a
thickness at the center of the crescent of over 16 feet.
Between Lake Erie and Lake Ontario there is a total difference
of level of 300 feet, and the amount of power represented by
the water at the falls has been estimated on different bases
from 6,750,000 horsepower up to not less than 16,800,000
horsepower, the latter being a rough calculation of Sir
William Siemens, who, in 1877, was the first to suggest the
use of electricity as the modern and feasible agent of
converting into useful power some of this majestic but
squandered energy. …

"It was Mr. Thomas Evershed, an American civil engineer, who
unfolded the plan of diverting part of the stream at a
considerable distance above the falls, so that no natural
beauty would be interfered with, while an enormous amount of
power would be obtained with a very slight reduction in the
volume of the stream at the crest of the falls. Essentially
scientific and correct as the plan now shows itself to be, it
found prompt criticism and condemnation, but not less quickly
did it rally the able and influential support of Messrs. W. B.
Rankine, Francis Lynde Stetson, Edward A. Wickes, and Edward
D. Adams, who organized the corporate interests that, with an
expenditure of £1,000,000 in five years, have carried out the
present work. So many engineering problems arose early in the
enterprise that after the survey of the property in 1890 an
International Niagara Commission was established in London,
with power to investigate the best existing methods of power
development and transmission, and to select from among them,
as well as to award prizes of an aggregate of £4,400. This
body included men like Lord Kelvin, Mascart, Coleman Sellers,
Turrettini, and Dr. Unwin, and its work was of the utmost
value. Besides this the Niagara Company and the allied
Cataract Construction Company enjoyed the direct aid of other
experts, such as Prof. George Forbes, in a consultative
capacity; while it was a necessary consequence that the
manufacturers of the apparatus to be used threw upon their
work the highest inventive and constructive talent at their
command.

"The time-honored plan in water-power utilization has been to
string factories along a canal of considerable length, with
but a short tail race. At Niagara the plan now brought under
notice is that of a short canal with a very long tail race.
The use of electricity for distributing the power allows the
factories to be placed away from the canal, and in any
location that may appear specially desirable or advantageous.
The perfected and concentrated Evershed scheme comprises a
short surface canal 250 feet wide at its mouth, 1¼ miles above
the fans, far beyond the outlying Three Sisters Islands, with
an intake inclined obliquely to the Niagara River. This canal
extends inwardly 1,700 feet, and has an average depth of some
12 feet, thus holding water adequate to the development of
about 100,000 horsepower. The mouth of the canal is 600 feet
from the shore line proper, and considerable work was
necessary in its protection and excavation. The bed is now of
clay, and the side walls are of solid masonry 17 feet high, 8
feet at the base, and 3 feet at the top. The northeastern side
of the canal is occupied by a power house, and is pierced by
ten inlets guarded by sentinel gates, each being the separate
entrance to a wheel pit in the power house, where the water is
used and the power is secured. The water as quickly as used is
carried off by a tunnel to the Niagara River again. …

"The wheel pit, over which the power house is situated, is a
long, deep, cavernous slot at one side, under the floor, cut
in the rock, parallel with the canal outside. Here the water
gets a fall of about 140 feet before it smites the turbines.
The arrangement of the dynamos generating the current up in
the power house is such that each of them may be regarded as
the screw at the end of a long shaft, just as we might see it
if we stood an ocean steamer on its nose with its heel in the
air. At the lower end of the dynamo shaft is the turbine in
the wheel pit bottom, just as in the case of the steamer shaft
we find attached to it the big triple or quadruple expansion
marine steam engine. …
{440}
The wheel pit which contains the turbines is 178 feet in
depth, and connects by a lateral tunnel with the main tunnel
running at right angles. This main tunnel is no less than
7,000 feet in length, with an average hydraulic slope of 6
feet in 1,000. It has a maximum height of 21 feet, and a width
of 18 feet 10 inches, its net section being 386 square feet.
The water rushes through it and out of its mouth of stone and
iron at a velocity of 26½ feet per second, or nearly 20 miles
an hour. More than 1,000 men were employed continuously for
more than three years in the construction of this tunnel. …

"The American Company has also pre-empted the great
utilization of the Canadian share of Niagara's energy. The
plan for this work proposes the erection of two power houses
of a total ultimate capacity of 125,000 horsepower. … With
both the Canadian and American plants fully developed, no less
than 350,000 horsepower will be available."

"Within the last five years," said the "Electrical Review," in
a "historical number" issued at the beginning of 1901, "there
have been built in many parts of the world electrical
installations of great magnitude, transmitting the power of
cataracts for considerable distances. The longest of these, in
California, operates over a distance of 115 miles. Perhaps the
largest of them is that at Niagara, where 105,000 horse power
is developed, and much of it transmitted … to the city of
Buffalo"—20 miles.

The first transmission of power from Niagara Falls to Buffalo
was made at midnight, November 15-16, 1896, when 1,000
horsepower was sent over the wires to the power-house of the
Buffalo Railway Company. The important event was signalled to
the citizens by the firing of cannon, the ringing of bells and
sounding of steam whistles.

ELECTRICAL SCIENCE:
The rotary magnetic field.
Polyphased currents.
Nikola Tesla's inventions.

"At about the same time [1888], Galileo Ferraris, in Italy,
and Nikola Tesla, in the United States, brought out motors
operating by systems of alternating currents displaced from
one another in phase by definite amounts and producing what is
known as the rotating magnetic field. This invention seems
destined to be one of the most important that has been made in
the history of electricity. The result of the introduction of
polyphase systems has been the ability to transmit power
economically for considerable distances, and, as this directly
operated to make possible the utilization of water-power in
remote places and the distribution of power over large areas,
the immediate outcome of the polyphase system was power
transmission; and the outcome of power transmission almost
surely will be the gradual supersession of coal and the
harnessing of the waste forces of Nature to do useful work."

_Electrical Review,
January 12, 1901._

The following description of Tesla's invention was given by N.
W. Perry in the "Engineering Magazine": "If the north and
south poles of a small horseshoe magnet be suspended over a
bar of soft iron free to revolve in a horizontal plane, or be
placed over an ordinary compass-needle, the latter will be
attracted at either end by the poles of the magnet and take up
a position parallel to a straight line drawn between the two
poles of the magnet. Now if the latter be revolved through any
angle the soft iron or needle will follow, being dragged
around by the magnet, and if the magnet be caused to revolve
regularly the iron will also revolve, being pulled around by
the full force of the magnet. It was not feasible, however, to
cause the magnet to revolve in this way, and Tesla's invention
consisted in obviating this trouble and, in fact, greatly
simplifying the problem. He conceived the idea that if he took
an iron ring and used two alternating currents, one of which had
its maximum value at the instant that the other had a zero
value—or, in other words, two currents whose periods were such
that one waned as the other increased—he could produce in that
iron ring by winding these circuits in alternate coils
surfaces that without any mechanical movement of the parts
would travel around that ring with a rapidity equal to the
number of changes of direction of the currents employed. He
thus had a ring, the north and south poles of which were
rapidly revolving just as would the poles of the horseshoe
magnet were it tied at its middle to a twisted string and
allowed to revolve. A piece of iron pivoted at its middle
placed concentric with this ring would therefore be dragged
around by the changing poles of the ring. He had thus
discovered what is somewhat awkwardly expressed by the
expression, 'the rotary magnetic field,' and also the use of
what have been termed 'polyphased currents'—the one referring
to the magnetism and the other to the combination of currents
by which this changing magnetism was produced. This discovery
is undoubtedly one of the most important that has ever been
made within the domain of alternating currents."

_Engineering Magazine,
volume 7, page 780._

Another of Tesla's inventions or discoveries which excited
greater popular interest was that which produced what were
called "high frequency effects," first publicly shown in
connection with a lecture at Columbia College, in the spring
of 1890. "Mr. Tesla started with the idea of setting matter
into vibration at a rate approximating that of light (some two
and a half millions a second), with the expectation that
under such violent molecular agitation it would emit light. He
has not as yet succeeded in obtaining so high a rate, but a
much lower one produced some very surprising luminous effects.
… The dynamo method for getting very high frequencies was soon
abandoned as inadequate, and the oscillatory discharge of a
Leyden jar or plate condensers was substituted. … Perhaps the
most surprising of the new facts elicited from his
investigations is that the shock due to these very high
voltage and high frequency currents can be supported by a
person without any serious inconvenience. He passes a current
of two hundred thousand volts through his body with perfect
impunity."

_F. J. Patten,
New Science Review,
volume 1, page 84._

ELECTRICAL SCIENCE:
Development of the Telephone System.

The annual report of the American Telephone and Telegraph
Company (by which the property and business of the American
Bell Telephone Company were taken over at the close of the
year 1899) for the year ending December 31, 1900, contains the
following brief review of the development and growth of the
telephone system, especially in the United States: "The year
just passed rounds out the quarter century, within which is
compassed the discovery and application of the art of
transmitting speech by telephone.
{441}
A brief review of the development and growth of this new
industry, which has become so important a factor in commercial
and social life, seems appropriate at this time. Twenty-five
years ago the wonderful invention of Professor Bell was made
known to the world. Twenty-three years ago the first telephone
exchange in the world was established in the United States, and
from that beginning has been built up the great system of
exchanges, and the network of connecting lines over which
conversation can be held between points over a thousand miles
apart. Twenty years ago there were 47,880 telephone
subscribers in the United States, and 29,714 miles of wire in
use for telephonic purposes. At the end of last year, there
were 800,880 exchange stations equipped with our instruments,
and 1,961,801 miles of wire were employed for exchange and
toll line service. The United States has, from the beginning,
held the leading place among nations in respect not only of
the extensive development of the business, but in the
employment of modern and improved appliances, tending to
greater efficiency of service.

"In connection with the record of development of telephone
service in this country, some comparison of the systems of
foreign countries is of interest. The latest reports that can
be obtained, part of which are for the year 1899, others to
the close of 1900, show the countries next in order to the
United States, as respects the development of telephone
service, to be the German Empire, having 229,391 stations;
Great Britain, 171,660; Sweden, 73,500; France, 59,927;
Switzerland, 38,864: Austria, 32,255; Russia, 31,376;
Norway, 29,446.

"As before stated, there were, at the close of last year, more
than 800,000 stations connected with the exchanges of our
licensee companies, which exceeds the aggregate number of
subscribers in all the countries of Continental Europe. In
addition to this, there were over 40,000 private line stations
equipped with our telephones. The number of exchange and toll
line connections in the United States now reaches almost two
thousand millions yearly."

More detailed and precise statistics of the telephone service
in the United States are given in the report as follows:

January 1, January 1,
1892. 1901.

Exchanges. 788 1,348
Branch offices. 509 1,427
Miles of wire on poles. 180,139 627,897
Miles of wire on buildings. 14,954 16,833
Miles of wire underground. 70,334 705,269
Miles of wire submarine. 1,029 4,203
Total miles of wire. 266,456 1,354,202
Total circuits. 186,462 508,262
Total employees. 8,376 32,837
Total stations. 216,017 800,880

The estimated number of exchange connections daily in the
United States, made up from actual count in most of the
exchanges, is 5,668,986. Or a total per year of about
1,825,000,000. The number of daily calls per station varies in
different exchanges from 1 to 15.9, the average throughout the
United States being 7.1. The average cost to the subscriber
varies according to the size of the exchange and character of
the service, from less than 1 to 9 cents per connection.

ELECTRICAL SCIENCE:
Dr. Pupin's revolutionary improvement
in long-distance Telephony.

The most important advance in telephonic science that has been
made since the invention of the Bell instrument was announced
at about the beginning of the new century, as the result of
studies pursued by Dr. Michael I. Pupin, of Columbia
University, New York. Mathematical and experimental
investigations which Dr. Pupin had been carrying on, for
several years, led him to a determination of the precise
intervals at which, if inductance coils are inserted in a long
conductor, an electric current in traversing it may be made to
travel far without much loss of force. He is said to have
taken a hint from seeing how waves of vibration in a cord are
strengthened by lightly "loading" it at certain exact points,
determined by the wave lengths. It is probably correct to
describe his invention as being a scientific ascertainment of
the points in a long telephonic circuit at which to load the
electric current in it, and the precise loading to be applied.

In a paper published in the "Western Electrician," describing
his investigations mathematically, Dr. Pupin wrote: "If an
increase in efficiency of wave transmission over a cord thus
loaded is to be obtained, it is evident that the load must be
properly subdivided and the fractional parts of the total load
must be placed at proper distances apart along the cord,
otherwise the detrimental effects due to reflections resulting
from the discontinuities thus introduced will more than
neutralize the beneficial effects derived from the increased
mass. … The insertion of inductance coils at periodically
recurring points along the wave conductor produces the same
effect upon electrical wave transmission as the distribution
of the small loads along the stretched cord … produces upon
mechanical wave transmission along the cord."

The result is said to be that conversation by telephone over a
distance of 3,000 miles is made not only practicable but easy,
and that it is believed to be as practicable through submarine
cables as through overland wires. If it does not make the
telephone a common instrument of communication from continent
to continent, it will, at least, improve oceanic telegraphy
beyond measure. According to newspaper report, Dr. Pupin's
invention has been sold to the Bell Telephone Company for a
very large sum.

ELECTRICAL SCIENCE:
Wireless Telegraphy.

"In 1864 Maxwell observed that electricity and light have the
same velocity, 186,400 miles a second, and he formulated the
theory that electricity propagates itself in waves which
differ from those of light only in being longer. This was
proved to be true by Hertz, in 1888, who showed that where
alternating currents of very high frequency were set up in an
open circuit, the energy might be conveyed entirely away from
the circuit into the surrounding space as electric waves. … He
demonstrated that electric waves move with the speed of light,
and that they can be reflected and refracted precisely as if
they formed a visible beam. At a certain intensity of strain
the air insulation broke down, and the air became a conductor.
This phenomenon of passing quite suddenly from a
non-conductive to a conductive state is … also to be noted
when air or other gases are exposed to the X ray.

{442}

"Now for the effect of electric waves such as Hertz produced,
when they impinge upon substances reduced to powder or
filings. Conductors, such as the metals, are of inestimable
service to the electrician; of equal value are non-conductors,
such as glass and gutta-percha, as they strictly
fence in an electric stream. A third and remarkable vista
opens to experiment when it deals with substances which, in
their normal state, are non-conductive, but which, agitated by
an electric wave, instantly become conductive in a high
degree. As long ago as 1866 Mr. S. A. Varley noticed that
black lead, reduced to a loose dust, effectually intercepted a
current from fifty Daniell cells, although the battery poles
were very near each other. When he increased the electric
tension fourfold to sixfold, the black-lead particles at once
compacted themselves so as to form a bridge of excellent
conductivity. On this principle he invented a
lightning-protector for electrical instruments, the incoming
flash causing a tiny heap of carbon dust to provide it with a
path through which it could safely pass to the earth.
Professor Temistocle Calzecchi Onesti of Fermo, in 1885, in an
independent series of researches, discovered that a mass of
powdered copper is a non-conductor until an electric wave
beats upon it; then, in an instant, the mass resolves itself
into a conductor almost as efficient as if it were a stout,
unbroken wire. Professor Edouard Branly of Paris, in 1891, on
this principle devised a coherer, which passed from resistance
to invitation when subjected to an electric impulse from afar.
He enhanced the value of his device by the vital discovery
that the conductivity bestowed upon filings by electric
discharges could be destroyed by simply shaking or tapping
them apart. …

"The coherer, as improved by Marconi, is a glass tube about 1½
inches long and about 1/12 of an inch in internal diameter.
The electrodes are inserted in this tube so as almost to
touch; between them is about 1/30 of an inch filled with a
pinch of the responsive mixture which forms the pivot of the
whole contrivance. This mixture is 90 per cent. nickel
filings, 10 per cent. hard silver filings, and a mere trace of
mercury; the tube is exhausted of air to within 1/10000 part.
… The coherer, when unexcited, forms a link which obstructs
the flow of a current eager to leap across. The instant that
an electric wave from the sending-station impinges upon the
coherer it becomes conductive; the current instantly glides
through it, and at the same time a current, by means of a
relay, is sent through [a] powerful voltaic battery, so as to
announce the signal through an ordinary telegraphic receiver.