Chapter IX: MISCELLANEOUS.--Spanish Fisheries.--Noticeable objects (1)

in the Spanish Court at the late Fisheries Exhibition. 6722

Duck Shooting at Montauk. 6723

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ELECTRICAL APPARATUS FOR MEASURING AND FOR DEMONSTRATION AT THE MUNICH EXHIBITION.

Apparatus for use in laboratories and cabinets of physics were quite numerous at the Munich Exhibition of Electricity, and very naturally a large number was to be seen there that presented little difference with present models. Several of them, however, merit citation. Among the galvanometers, we remarked an apparatus that was exhibited by Prof. Zenger, of Prague. The construction of this reminded us of that of other galvanometers, but it was interesting in that its inventor had combined in it a series of arrangements that permitted of varying its sensitiveness within very wide limits. This apparatus, which Prof. Zenger calls a "Universal Rheometer" (Fig. 1), consists of a bobbin whose interior is formed of a piece of copper, whose edges do not meet, and which is connected by strips of copper with two terminals. This internal shell is capable of serving for currents of quantity, and, when the two terminals are united by a wire, it may serve as a deadener. Above this copper shell there are two identical coils of wire which may, according to circumstances, be coupled in tension or in series, or be employed differentially. Reading is performed either by the aid of a needle moving over a dial, or by means of a mirror, which is not shown in the figure. Finally, there is a lateral scale, R, which carries a magnetized bar, A, that may be slid toward the galvanometer. This magnet is capable of rendering the needle less sensitive or of making it astatic. In order to facilitate this operation, the magnet carries at its extremity a tube which contains a bar of soft iron that may be moved slightly so as to vary the length of the magnet. Prof. Zenger calls this arrangement a magnetic vernier. It will be seen that, upon combining all the elements of the apparatus, we can obtain very different combinations; and, according to the inventor, his rheometer is a substitute for a dozen galvanometers of various degrees of sensitiveness, and permits of measuring currents of from 20 amperes down to 1/50000000 an ampere. The apparatus may even be employed for measuring magnetic forces, as it constitutes a very sensitive magnetometer.

Prof. Zenger likewise had on exhibition a "Universal Electrometer" (Fig. 2), in which the fine wire that served as an electrometric needle was of magnetized steel suspended by a cotton thread. In this instrument, a silver wire, t, terminating in a ball, is fixed to a support, C, hanging from a brass disk, P, placed upon the glass case of the apparatus. It will be seen that if we bring an electrified body near the disk, P, a deviation of the needle will occur. The sensitiveness of the latter may be regulated by a magnetic system like that of the galvanometer. Finally, a disk, P', which may be slid up and down its support, permits of the instrument being used as a condensing electrometer, by giving it, according to the distance of the disks, different degrees of sensitiveness. One constructor who furnished much to this part of the exhibition was Mr. Th. Edelmann of Munich, whose apparatus are represented in a group in Fig. 3. Among them we remark the following: A quadrant electrometer (Fig. 4), in which the horizontal 8-shaped needle is replaced by two connected cylindrical surfaces that move in a cylinder formed of four parts; a Von Beetz commutator; spyglasses with scale for reading measuring instruments (Fig. 3); apparatus for the study of magnetic variations, of Lamont (Fig. 3) and of Wild (Fig. 5); different types of the Wiedemann galvanometer; an electrometer for atmospheric observations (Fig. 6); a dropping apparatus (Fig. 7), in which the iron ball opens one current at a time at the moment it leaves the electro-magnet and when it reaches the foot of the support, these two breakages producing two induction sparks that exactly limit the length to be taken in order to measure the time upon the tracing of the chronoscope tuning-fork; an absolute galvanometer; a bifilar galvanometer (Fig. 8) for absolute measurements, in which the helix is carried by two vertical steel wires stretched from o to u, and which is rendered complete by a mirror for the reading, and a second and fixed helix, so that an electro-dynamometer may be made of it; and, finally, a galvanometer for strong currents, having a horseshoe magnet pivoted upon a vertically divided column which is traversed by the current, and a plug that may be arranged at different heights between the two parts of the column so as to render the apparatus more sensitive (Fig. 9).

We may likewise cite the exhibit of Mr. Eugene Hartmann of Wurtzburg, which comprised a series of apparatus of the same class as those that we have just enumerated--spyglasses for the reading of apparatus, galvanometers, magnetometers, etc.

Specially worthy of remark were the apparatus of Mr. Kohlrausch for measuring resistances by means of induction currents, and a whole series of accessory instruments.

Among the objects shown by other exhibitors must be mentioned Prof. Von Waltenhofen's differential electromagnetic balance. In this, two iron cylinders are suspended from the extremities of a balance. One of them is of solid iron, and the other is of thin sheet iron and of larger diameter and is balanced by an additional weight. Both of them enter, up to their center, two solenoids. If a strong current be passed into these latter, the solid cylinder will be attracted; but if, on the contrary, the current be weak, the hollow cylinder will be attracted. If the change in the current's intensity occur gradually, there will be a moment in which the cylinders will remain in equilibrium.

Prof. Zenger's differential photometer that we shall finally cite is an improvement upon Bunsen's. In the latter the position of the observer's eye not being fixed, the aspect of the spot changes accordingly, and errors are liable to result therefrom. Besides, because of the non-parallelism of the luminous rays, each of the two surfaces is not lighted equally, and hence again there may occur divergences. In order to avoid such inconveniences, Prof. Zenger gives his apparatus (Fig. 10) the following form: The screen, D, is contained in a cubical box capable of receiving, through apertures, light from sources placed upon the two rules, R and R'. A flaring tube, P, fixes the position of the eye very definitely. As for the screen, this is painted with black varnish, and three vertical windows, about an inch apart, are left in white upon its paper. Over one of the halves of these parts a solution of stearine is passed. To operate with the apparatus, in comparing two lights, the central spot is first brought to invisibility, and the distances of the sources are measured. A second determination is at once made by causing one of the two other spots to disappear, and the mean of the two results is then taken. As, at a maximum, there is a difference corresponding to 3/100 of a candle between the illumination of the two neighboring windows, in the given conditions of the apparatus, the error is thus limited to a half of this value, or 2 per cent. of that of one candle.

Among the apparatus designed for demonstration in lecture courses, we remarked a solenoid of Prof. Von Beetz for demonstrating the constitution of magnets (Fig. 11), and in which eight magnetized needles, carrying mica disks painted half white and half black, move under the influence of the currents that are traversing the solenoid, or of magnets that are bought near to it externally. Another apparatus of the same inventor is the lecture-course galvanometer (Fig. 3), in which the horizontal needle bends back vertically over the external surface of a cylinder that carries divisions that are plainly visible to spectators at a distance.

Finally, let us cite an instrument designed for demonstrating the principle of the Gramme machine. A circular magnet, AA', is inserted into a bobbin, B, divided into two parts, and moves under the influence of a disk, L, actuated by a winch, M. This system permits of studying the currents developed in each portion of the bobbin during the revolution of the ring (Fig. 12).

To end our review of the scientific apparatus at the exhibition we shall merely mention Mr. Van Rysselberghe's registering thermometrograph (shown in Figs. 13 and 14), and shall then say a few words concerning two types of registering apparatus--Mr. Harlacher's water-current register and Prof. Von Beetz's chronograph.

Mr. Harlacher's apparatus was devised by him for studying the deep currents of the Elbe. It is carried (Fig. 15) by a long, vertical, hollow rod which is plunged into the river. A cord that passes over a pulley, P, allows of the apparatus, properly so called, being let down to a certain depth in the water. What is registered is the velocity of the vanes that are set in action by the current, and to effect such registry each revolution of the helix produces in the box, C, an electric contact that closes the circuit in the cable, F, attached to the terminals, B. This cable forms part of a circuit that includes a pile and a registering apparatus that is seen at L, outside of the box in which it is usually inclosed. In certain cases, a bell whose sound indicates the velocity of the current to the ear is substituted for the registering apparatus.

Fig. 16 represents another type of the same apparatus in which the mechanism of the contact is uncovered. The supporting rod is likewise in this type utilized as a current conductor.

It now remains to say a few words about Prof. Von Beetz's chronograph. This instrument (Fig. 17) is designed for determining the duration of combustion of different powders, the velocity of projectiles, etc. The registering drum, T, is revolved by hand through a winch, L, and the time is inscribed thereon by an electric tuning fork, S, set in motion by the large electro-magnet, E F. Each undulation of the curves corresponds to a hundredth of a second. The tuning-fork and the registering electro-magnets, G and H, are placed upon a regulatable support, C, by means of which they may be given any position desired.

The style, c, of the magnet, C, traces a point every second in order to facilitate the reading. The style, b, of the electro-magnet, H, registers the beginning and end of the phenomena that are being studied.

The apparatus is arranged in such a way that indications may thus be obtained upon the drum by means of induction sparks jumping between the style and the surface of the cylinder. To the left of the figure is seen the apparatus constructed by Lieutenant Ziegler for experimenting on the duration of combustion of bomb fuses.

Shortly after the drum has commenced revolving, the contact, K, opens a current which supports the heavy armature, P, of an electro-magnet, M. This weight, P, falls upon the rod, d, and inflames the fuse, Z, at that very instant. At this precise moment the electro-magnet, H, inscribes a point, and renews it only when the cartridge at the extremity of the fuse explodes.

This apparatus perhaps offers the inconvenience that the drum must be revolved by hand, and it would certainly be more convenient could it be put in movement at different velocities by means of a clockwork movement that would merely have to be thrown into gear at the desired moment. As it is, however, it presents valuable qualities, and, although it has already been employed in Germany for some time, it will be called upon to render still more extensive services.

We have now exhausted the subject of the apparatus of precision that were comprised in the Munich Exhibition. In general, it may be said that this class of instruments was very well represented there as regards numbers, and, on another hand, the manufacturers are to be congratulated for the care bestowed on their construction.--_La Lumiere Electrique_.

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COPPER VOLTAMETER.

Dr. Hammerl, of the Vienna Academy of Sciences, has made some experiments upon the disturbing influences on the correct indications of a copper voltameter. He investigated the effects of the intensity of the current, the distance apart of the plates, and their preparation before weighing. The main conclusion which he arrives at is this: That in order that the deposit should be proportional to the intensity of the current, the latter ought not to exceed seven ampères per square decimeter of area of the cathode.

* * * * *

Speaking of steel ropes as transmitters of power, Professor Osborne Reynolds says these have a great advantage over shafts, for the stress on the section will be uniform, the velocity will be uniform, and may be at least ten to fifteen times as great as with shafts--say 100 ft. per second; the rope is carried on friction pulleys, which may be at distances 500 ft. or 600 ft. so that the coefficient of friction will not be more than 0.015, instead of 0.04.

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A NEW OXIDE OF COPPER BATTERY.

By MM. F. DE LALANDE and G. CHAPERON.

We have succeeded in forming a new battery with a single liquid and with a solid depolarizing element by associating oxide of copper, caustic potash, and zinc.

This battery possesses remarkable properties. Depolarizing electrodes are easily formed of oxide of copper. It is enough to keep it in contact with a plate or a cell of iron or copper constituting the positive pole of the element.

Fig. 1 represents a very simple arrangement. At the bottom of a glass jar, V, we place a box of sheet iron, A, containing oxide of copper, B. To this box is attached a copper wire insulated from the zinc by a piece of India rubber tube. The zinc is formed of a thick wire of this metal coiled in the form of a flat spiral, D, and suspended from a cover, E, which carries a terminal, F, connected with the zinc; an India-rubber tube, G, covers the zinc at the place where it dips into the liquid, to prevent its being eaten away at this level.

The jar is filled with a solution containing 30 or 40 per cent. of potash. This arrangement is similar to that of a Callaud element, with this difference--that the depolarizing element is solid and insoluble.

To prevent the inconveniences of the manipulation of the potash, we inclose a quantity of this substance in the solid state necessary for an element in the box which receives the oxide of copper, and furnish it with a cover supported by a ring of caoutchouc. It suffices then for working the battery to open the box of potash, to place it at the bottom of the jar, and to add water to dissolve the potash; we then pour in the copper oxide inclosed in a bag.

We also form the oxide of copper very conveniently into blocks. Among the various means which might be employed, we prefer the following:

We mix with the oxide of copper oxychloride of magnesium in the form of paste so as to convert the whole into a thick mass, which we introduce into metal boxes.

The mass sets in a short time, or very rapidly by the action of heat, and gives porous blocks of a solidity increasing with the quantity of cement employed (5 to 10 per cent.).

Fig. 2 represents an arrangement with blocks. The jar V, is provided with a cover of copper, E, screwing into the glass. This cover carries two vertical plates of sheet-iron, A, A', against which are fixed the prismatic blocks, B, B, by means of India rubber bands. The terminal, C, carried by the cover constitutes the positive pole. The zinc is formed of a single pencil, D, passing into a tube fixed to the center of the cover. The India rubber, G, is folded back upon this tube so as to make an air-tight joint.

The cover carries, besides, another tube, H, covered by a split India-rubber tube, which forms a safety valve.

The closing is made hermetical by means of an India rubber tube, K, which presses against the glass and the cover. The potash to charge the element is in pieces, and is contained either in the glass jar itself or in a separate box of sheet-iron.

Applying the same arrangement, we form hermetically sealed elements with a single plate of a very small size.

The employment of cells of iron, cast-iron, or copper, which are not attacked by the exciting liquid, allows us to easily construct elements exposing a large surface (Fig. 3).

The cell, A, forming the positive pole of the battery is of iron plate brazed upon vertical supports; it is 40 centimeters long by 20 centimeters wide, and about 10 centimeters high.

We cover the bottom with a layer of oxide of copper, and place in the four corners porcelain insulators, L, which support a horizontal plate of zinc, D, D', raised at one end and kept at a distance from the oxide of copper and from the metal walls of the cell; three-quarters of this is filled with a solution of potash. The terminals, C and M, fixed respectively to the iron cell and to the zinc, serve to attach the leading wires. To avoid the too rapid absorption of the carbonic acid of the air by the large exposed surface, we cover it with a thin layer of heavy petroleum (a substance uninflammable and without smell), or better still, we furnish the battery with a cover. These elements are easily packed so as to occupy little space.

We shall not discuss further the arrangements which may be varied infinitely, but point out the principal properties of the oxide of copper, zinc, and potash battery. As a battery with a solid depolarizing element, the new battery presents the advantage of only consuming its element, in proportion to its working; amalgamated zinc and copper are, in fact, not attacked by the alkaline solution, it is, therefore, durable.

Its electromotive force is very nearly one volt. Its internal resistance is very low. We may estimate it at 1/3 or 1/4 of an ohm for polar surfaces one decimeter square, separated by a distance of five centimeters.

The rendering of these couples is considerable; the small cells shown in Figs. 1 and 2 give about two amperes in short circuit; the large one gives 16 to 20 amperes. Two of these elements can replace a large Bunsen cell. They are remarkably constant. We may say that with a depolarizing surface double that of the zinc the battery will work without notable polarization, and almost until completely exhausted, even under the most unfavorable conditions. The transformation of the products, the change of the alkali into an alkaline salt of zinc, does not perceptibly vary the internal resistance. This great constancy is chiefly due to the progressive reduction of the depolarizing electrode to the state of very conductive metal, which augments its conductivity and its depolarizing power.

The peroxide of manganese, which forms the base of an excellent battery for giving a small rendering, possesses at first better conductivity than oxide of copper, but this property is lost by reduction and transformation into lower oxides. It follows that the copper battery will give a very large quantity of electricity working through low resistances, while under these conditions manganese batteries are rapidly polarized.

The energy contained in an oxide of copper and potash battery is very great, and far superior to that stored by an accumulator of the same weight, but the rendering is much less rapid. Potash may be employed in concentrated solution at 30, 40, 60 per cent.; solid potash can dissolve the oxide of zinc furnished by a weight of zinc more than one-third of its own weight. The quantity of oxide of copper to be employed exceeds by nearly one-quarter the weight of zinc which enters into action. These data allow of the reduction of the necessary substances to a very small relative weight.

The oxide of copper batteries have given interesting results in their application to telephones. For theatrical purposes the same battery may be employed during the whole performance, instead of four or five batteries. Their durability is considerable; three elements will work continuously, night and day, Edison's carbon microphones for more than four months without sensible loss of power.

Our elements will work for a hundred hours through low resistances, and can be worked at any moment, after several months, for example. It is only necessary to protect them by a cover from the action of the carbonic acid of the atmosphere.

We prefer potash to soda for ordinary batteries, notwithstanding its price and its higher equivalent, because it does not produce, like soda, creeping salts. Various modes of regeneration render this battery very economical. The deposited copper absorbs oxygen pretty readily by simple exposure to damp air, and can be used again. An oxidizing flame produces the same result very rapidly.

Lastly, by treating the exhausted battery as an accumulator, that is to say, by passing a current through it in the opposite direction, we restore the various products to their original condition; the copper absorbs oxygen, and the alkali is restored, while the zinc is deposited; but the spongy state of the deposited zinc necessitates its being submitted to a process, or to its being received upon a mercury support. Again, the oxide of copper which we employ, being a waste product of brazing and plate works, unless it be reduced, loses nothing of its value by its reduction in the battery; the depolarization may therefore be considered as costing scarcely anything. The oxide of copper battery is a durable and valuable battery, which by its special properties seems likely to replace advantageously in a great number of applications the batteries at present in use.

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FARCOT'S SIX HORSE POWER STEAM ENGINE.

This horizontal steam engine, recently constructed by Mr. E.D. Farcot for actuating a Cance dynamo-electric machine, consists of a cast iron bed frame, A, upon which are mounted all the parts. The two jacketed, cylinders, B and C, of different diameters, each contains a simple-acting piston. The two pistons are connected by one rod in common, which is fixed at its extremity to a cross-head, D, running in slides, E and F, and is connected with the connecting rod, G. The head of the latter is provided with a bearing of large diameter which embraces the journal of the driving shaft, H.

The steam enters the valve-box through the orifice, J, which is provided with a throttle-valve, L, that is connected with a governor placed upon the large cylinder. The steam, as shown in Fig. 2 (which represents the piston at one end of its travel), is first admitted against the right surface of the small piston, which it causes to effect an entire stroke corresponding to a half-revolution of the fly-wheel. The stroke completed, the slide-valve, actuated by an eccentric keyed to the driving shaft, returns backward and puts the cylinders, B and C, in communication. The steam then expands and drives the large piston to the right, so as to effect the second half of the fly-wheel's revolution. The exhaust occurs through the valve chamber, which, at each stroke, puts the large cylinder in connection with the eduction port, M.

The volume of air included between the two pistons is displaced at every stroke, so that, according to the position occupied by the pistons, it is held either by the large or small cylinder. The necessary result of this is that a compression of the air, and consequently a resistance, is brought about. In order to obviate this inconvenience, the constructor has connected the space between the two pistons at the part, A', of the frame by a bent pipe. The air, being alternately driven into and sucked out of this chamber, A', of relatively large dimensions, no longer produces but an insignificant resistance.

As shown in Fig. 5, there may be applied to this engine a variable expansion of the Farcot type. The motor being a single acting one, a single valve-plate suffices. This latter is, during its travel, arrested at one end by a stop and at the other by a cam actuated by the governor. Upon the axis of this cam there is keyed a gear wheel, with an endless screw, which permits of regulating it by hand.

This engine, which runs at a pressure of from 5 to 6 kilogrammes, makes 150 revolutions per minute and weighs 2,000 kilogrammes. --_Annales Industrielles_.

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FOOT LATHES.

We illustrate a foot lathe constructed by the Britannia Manufacturing Company, of Colchester, and specially designed for use on board ships. These lathes, says _Engineering_, are treble geared, in order that work which cannot usually be done without steam power may be accomplished by foot. For instance, they will turn a 24 inch wheel or plate, or take a half-inch cut off a 3 inch shaft, much heavier work than can ordinarily be done by such tools. They have 6 inch centers, gaps 7½ inches wide and 6½ inches deep, beds 4 feet 6 inches long by 8¾ inches on the face and 6 inches in depth, and weigh 14 cwt. There are three speeds on the cone pulley, 9 inches, 6 inches, and 4 inches in diameter and 1½ inches wide. The gear wheels are 9/16 inch pitch and 1½ inches wide on face. The steel leading screw is 1½ inches in diameter by ¼ inch pitch. Smaller sizes are made for torpedo boats and for places where space is limited.

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ENDLESS TROUGH CONVEYER.

The endless trough conveyer is one of the latest applications of link-belting, consisting primarily of a heavy chain belt carried over a pair of wheels, and in the intermediate space a truck on which the train runs. This chain or belt is provided with pans which, as they overlap, form an endless trough. Power being applied to revolve one of the wheels, the whole belt is thereby set in motion and at once becomes an endless trough conveyer. The accompanying engraving illustrates a section of this conveyer. A few of the pans are removed, to show the construction of the links; and above this a link and coupler are shown on a larger scale. As will be seen, the link is provided with wings, to form a rigid support for the pan to be riveted to it. To reduce friction each link is provided with three rollers, as will be seen in the engraving. This outfit makes a fireproof conveyer which will handle hot ore from roasting kiln to crusher, and convey coal, broken stone, or other gritty and coarse material. The Link Belt Machinery Company, of Chicago, is now erecting for Mr. Charles E. Coffin, of Muirkirk, Md., about 450 ft. of this conveyer, which is to carry the hot roasted iron ore from the kilns on an incline of about one foot in twelve up to the crusher. This dispenses with the barrow-men, and at an expenditure of a few more horsepower becomes a faithful servant, ready for work in all weather and at all times of day or night. This company also manufactures ore elevators of any capacity, which, used in connection with this apparatus, will handle perfectly anything in the shape of coarse, gritty material. It might be added that the endless trough conveyer is no experiment. Although comparatively new in this country, the American _Engineering and Mining Journal_ says it has been in successful operation for some time in England, the English manufacturers of link-belting having had great success with it.

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RAILROAD GRADES OF TRUNK LINES.

On the West Shore and Buffalo road its limit of grade is 30 feet to the mile going west and north, and 20 feet to the mile going east and south. Next for easy grades comes the New York Central and Hudson River road. From New York to Albany, then up the valley of the Mohawk, till it gradually reaches the elevation of Lake Erie, it is all the time within the 500 foot level, and this is maintained by its connections on the lake borders to Chicago, by the "Nickel Plate," the Lake Shore and Michigan Southern, and the Canada Southern and Michigan Central.

The Erie, the Pennsylvania, and the Baltimore and Ohio roads pass through a country so mountainous that, much as they have expended to improve their grades, it is practically impossible for them to attain the easy grades so much more readily obtained by the trunk lines following the great natural waterways originally extending almost from Chicago to New York.

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ENGLISH EXPRESS TRAINS.

The _Journal of the Statistical Society_ for September contains an elaborate paper by Mr. E. Foxwell on "English Express Trains; their Average Speed, etc. with Notes on Gradients, Long Runs, etc." The author takes great pains to explain his definition of the term "express trains," which he finally classifies thus: (a) The general rule; those which run under ordinary conditions, and attain a journey-speed of 40 and upward. These are about 85 per cent. of the whole. (b) Equally good trains, which, running against exceptional difficulties, only attain, perhaps, a journey speed as low as 36 or 37. These are about 5 per cent. of the whole. (c) Trains which should come under (a), but which, through unusually long stoppages or similar causes, only reach a journey speed of 39. These are about 10 per cent.[1] of the whole.

[Footnote 1: 10 per cent. of the number, but not of the mileage,
of the whole; for most of this class run short journeys.]

He next explains that by "running average" is meant: The average speed per hour while actually in motion from platform to platform, i.e., the average speed obtained by deducting stoppages. Thus the 9-hour (up) Great Northern "Scotchman" stops 49 minutes on its journey from Edinburgh to King's Cross, and occupies 8 hours 11 minutes in actual motion; its "running average" is therefore 48 miles an hour, or, briefly, "r.a.=48." The statement for this train will thus appear: Distance in miles between Edinburgh and King's Cross, 392½; time, 9 h. 0 m.; journey-speed, 43.6; minutes stopped, 49; running average, 48.

Mr. Foxwell then proceeds to describe in detail the performances of the express trains of the leading English and Scottish railways--in Ireland there are no trains which come under his definition of "express"--giving the times of journey, the journey-speeds, minutes stopped on way, and running averages, with the gradients and other circumstances bearing on these performances. He sums up the results for the United Kingdom, omitting fractions, as follows:

=========================================================================
Extent of| | | Average | | |
System | | Distinct | Journey- | Running | Express |
in Miles.| | Expresses.| speed. | Average.| Mileage.|
---------+-------------------+-----------+----------+---------+---------+
1773 | North-Western | {54} 82 | 40 | 43 | 10,400 |
| | {28} | | | |
1260 | Midland | 66 | 41 | 45 | 8,860 |
928 | Great Northern | {48} 67 | 43 | 46 | 6,780 |
| | {19} | | | |
907 | Great Eastern | 34 | 41 | 43 | 3,040 |
2267 | Great Western | 18 | 42 | 46 | 2,600 |
1519 | North-Eastern | 19 | 40 | 43 | 2,110 |
290 | Manch., Sheffield,| 49 | 43 | 44 | 2,318 |
| and Lincoln | | | | |
767 | Caledonian | 16 | 40 | 42 | 1,155 |
435 | Brighton | 13 | 41 | 41 | 1,155 |
382 | South-Eastern | 12 | 41 | 41 | 940 |
329 | Glasgow and | 8 | 41 | 43 | 920 |
| South-Western | | | | |
796 | London and | 3 | 41 | 44 | 890 |
| South-Western | | | | |
984 | North British | 11 | 39 | 41 | 830 |
153 | Chatham and Dover | 9 | 42 | 43 | 690 |
+-----------+----------+---------+---------+
| 407 | 41 | 44 | 42,683 |
=========================================================================

A total of 407 express trains, whose average journey-speed is 41.6, and which run 42,680 miles at an average "running average" of 44.3 miles per hour.

If we arrange the companies according to their speed instead of their mileage, the order is:

Average
r.a. Miles
Great Northern. 46 6,780
Great Western. 46 [2]2,600
Midland. 45 8,860
Manchester, Sheffield, and Lincoln 44 2,318
London and South-Western. 44 890
North-Western. 43 10,400
Glasgow and South-Western. 43 920
Great Eastern. 43 3,040
North-Eastern. 43 2,110
Chatham and Dover. 43 690
Caledonian. 42 1,155
South-Eastern. 41 940
Brighton. 41 1,155
North British. 31 825

[Footnote 2: Not reckoning mileage west of Exeter.]

EXPRESS ROUTES ARRANGED IN ORDER OF DIFFICULTY OF GRADIENTS, ETC.

North British,
Caledonian,
Manch., Sheffield & Lincoln,
Midland,
Glasgow and South-Western,
Chatham and Dover,
South-Eastern,
Great Northern,
South-Western,
Great Eastern,
Brighton,
North-Western,
North-Eastern,
Great Western.

LONG RUNS IN ENGLAND.

=======================================================================
| Number of | Average | Running
| Trains. | Speed. | Averages.
------------------------------------+-----------+---------+------------
| | Miles. | Miles.
Midland. | 104 | 53 | 46 (5,512)
North-Western. | 98 | 60 | 45 (5,880)
Great Northern. | 49 | 73 | 50 (3,616)
Great Western. | 24 | 56 | 48 (1,344)
Great Eastern. | 24 | 56 | 42 (1,362)
Brighton. | 23 | 45 | 42 (1,047)
North-Eastern. | 20 | 56 | 44 (1,120)
South-Western. | 13 | 47 | 44 (615)
South-Eastern. | 12 | 66 | 42 (795)
Chatham and Dover. | 8 | 63 | 45 (504)
Caledonian. | 8 | 59 | 45 (476)
Glasgow and South-Western | 8 | 58 | 44 (468)
Manchester, Sheffield, and Lincoln. | 8 | 48 | 43 (390)
North British. | 7 | 60 | 40 (423)
------------------------------------+-----------+---------+------------
Total. | 406 | 58 | 45 (23,550)
=======================================================================

From this it will be seen that the three great companies run 61 per cent. of the whole express mileage, and 62 per cent. of the whole number of long runs.

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IMPROVED OIL MILL.

The old and cumbersome methods of crushing oil seeds by mechanical means have during the last few years undergone a complete revolution. By the old process, the seed, having been flattened between a pair of stones, was afterward ground by edge stones, weighing in some cases as much as 20 tons, and working at about eighteen revolutions per minute. Having been sufficiently ground, the seed was taken to a kettle or steam jacketed vessel, where it was heated, and thence drawn--in quantities sufficient for a cake--in woollen bags, which were placed in a hydraulic press. From four to six bags was the utmost that could be got into the press at one time, and the cakes were pressed between wrappers of horsehair on similar material. All this involved a good deal of manual labor, a cumberstone plant, and a considerable expense in the frequent replacing of the horsehair wrappers, each of which involved a cost of about £4. The modern requirements of trade have in every branch of industry ruthlessly compelled the abandonment of the slow, easy-going methods which satisfied the times when competition was less keen. Automatic mechanical arrangements, almost at every turn, more effectually and at greatly increased speed, complete manufacturing operations previously performed by hand, and oil-seed crushing machinery has been no exception to the general rule. The illustrations we give represent the latest developments in improved oil-mill machinery introduced by Rose, Downs & Thompson, named the "Colonial" mill, and recently we had an opportunity of inspecting the machinery complete before shipment to Calcutta, where it is being sent for the approaching exhibition. As compared with the old system of oil-seed crushing, Messrs. Rose, Downs & Thompson claim for their method, among other advantages, a great saving in driving power, economy of space, a more perfect extraction of the oil, an improved branding of the cakes, a saving of 50 per cent. in the labor employed in the press-room, with also a great saving in wear and tear, while the process is equally applicable to linseed, cottonseed, rapeseed, or similar seeds. In addition to these improvements in the system, the "Colonial" mill has been specially designed in structural arrangement to meet the requirements of exporters. The machinery and engine are self-contained on an iron foundation, so that there is no need of skilled mechanics to erect the mill, nor of expensive stone foundations, while the building covering the mill can, if desired, be of the lightest possible description, as no wall support is required. The mill consists of the following machinery: A vertical steel boiler, 3 ft. 7 in. diameter, 8 ft. 1½ in. high, with three cross tubes 7½ in. diameter, shell 5/16 in. thick, crown 3/8 in. thick, uptake 9 in. diameter, with all necessary fittings, and where wood fuel is used extra grate area can be provided. This boiler supplies the steam not only for the engine, but also for heating and damping the seed in the kettle. The engine is vertical, with 8 in. cylinder and 12 in. stroke, with high speed governors, and stands on the cast iron bed-plate of the mill. This bed-plate, which is in three sections, is about 30 ft. long, and is planed and shaped to receive the various machines, which, when the top is leveled, can be fixed in their respective places by any intelligent man, and when the machines are in position they form a support for the shafting. The seed to be crushed is stored in a wooden bin, placed above and behind the roll frame hopper. The roll frame has four chilled cast iron rolls, 15 in. face, 12 in. diameter, so arranged as to subject the seed to three rollings, with patent pressure giving apparatus. These rolls are driven by fast and loose pulleys by the shaft above. After the last rolling the seed falls through an opening in the foundation plate in a screen driven from the bottom roll shaft by a belt. This conveys the seed in a trough to a set of elevators, which supply it continuously to the kettle. This kettle, which is 3 ft. 6 in. internal diameter and 20 in. deep, is made of cast iron and of specially strong construction. There is only one steam joint in it, and to reduce the liability of leakage this joint is faced in a lathe. The inside furnishings of the kettle are a damping apparatus with perforated boss, upright shaft, stirrer, and delivery plate, and patent slide. The kettle body is fitted with a wood frame and covered with felt, which is inclosed within iron sheeting. The crushed seed is heated in the kettle to the required temperature by steam from the boiler, and it is also damped by a jet of steam which is regulated by a wheel valve with indicating plate. When the required temperature has been obtained, the seed is withdrawn by a measuring box through a self-acting shuttle in the kettle bottom, and evenly distributed over a strip of bagging supported on a steel tray in a Virtue patent moulding machine, where it undergoes a compression sufficient to reduce it to the size that can be taken in by the presses, but not sufficient to cause any extraction of the oil. The seed leaves the moulding machine in the form of a thick cake from nine to eleven pounds in weight, and each press is constructed to take in twelve of these cakes at once. The press cylinders are 12 in. diameter and are of crucible cast steel. To insure strength of construction and even distribution of strain throughout the press, all the columns, cylinders, rams, and heads are planed and turned accurately to gauges, and the pockets that take the columns, in the place of being cast, as is sometimes usual, with fitting strips top and bottom, are solid throughout, and are planed or slotted out of the solid to gauges. The pressure is given by a set of hydraulic pumps made of crucible cast steel and bored out of the solid. One of the pump rams is 2½ in. diameter, and has a stroke of 7 in. This ram gives only a limited pressure, and the arrangements are such as to obtain this pressure upon each press in about fourteen seconds. This pump then automatically ceases running, and the work is taken up by a second plunger, having a ram 1 in. diameter and stroke of 7 in., the second pump continuing its work until a gross pressure of two tons per square inch is attained, which is the maximum, and is arrived at in less than two minutes. For shutting off the communication between the presses, the stop valves are so arranged that either press may be let down, or set to work without in the smallest degree affecting the other. The oil from the presses is caught in an oil tank behind, from which an oil pump, worked by an eccentric, forces it in any desired direction. The cakes, on being withdrawn from the press, are stripped of the bagging and cut to size in a specially arranged paring machine, which is placed off the bed-plate behind the kettle, and is driven by the pulley shown on the main shaft. The paring machine is also fitted with an arrangement for reducing the parings to meal, which is returned to the kettle, and again made up into cakes. The presses shown have corrugated press plates of Messrs. Rose, Downs & Thompson's latest type, but the cakes produced by this process can have any desired name or brand in block letters put upon them. The edges on the upper plate, it may be added, are found of great use in crushing some classes of green or moist seed. The plant, of which we give illustrations opposite, is constructed to crush about four tons of seed per day of eleven hours, and the manual labor has been so reduced to a minimum that it is intended to be worked by one man, who moulds and puts the twenty-four cakes into the presses, and while they are under pressure is engaged paring the cakes that have been previously pressed. In crushing castor-oil seed, a decorticating machine or separator can be combined with the mill, but in such a case the engine and boiler would require to be made larger.--_The Engineer_.

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APPARATUS FOR SEPARATING SUBSTANCES CONTAINED IN THE WASTE WATERS OF PAPER MILLS, ETC.

For extracting such useful materials as are contained in the waste waters of paper mills, cloth manufactories, etc., and, at the same time, for purifying such waters, Mr. Schuricht, of Siebenlehn, employs a sort of filter like that shown in the annexed Figs. 1 and 2, and underneath which he effects a vacuum.

The apparatus, A, is divided into two compartments, which are separated by a longitudinal partition. Above the stationary bottom, a, there is arranged a lattice-work grating or a strong wire cloth, b, upon which rests the filtering material, c, properly so called. The reservoir is divided transversely by several partitions, d, of different heights. The liquor entering through the leader, f, traverses the apparatus slowly, as a consequence of the somewhat wide section of the layer. But, in order that it may traverse the filtering material, it is necessary that, in addition to this horizontal motion, it shall have a downward one. As far as to the top of the partitions, d, there form in front of the latter certain layers which do not participate in the horizontal motion, but which can only move downward, as a consequence of the permeability of the bottom. It results from this that the heaviest solid particles deposit in the first compartment, while the others run over the first partition, d, and fall into one of the succeeding compartments, according to their degree of fineness, while the clarified water makes its exit through the spout, g. When the filtering layer, c, has become gradually impermeable, the cock, i, of a jet apparatus, k, is opened, in order to suck out the clarified water through the pipe, r.--_Dingler's Polytech. Journ., after Bull. Musée de l'Industrie_.

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LARGE BLUE PRINTS.

By W.B. PARSONS, JR., C.E.

I send you a description of a device that I got up for the N.Y., L.E., and W.R.R. division office at Port Jervis, by which I overcame the difficulties incident to large glasses. The glass was 58 inches long, 84 inches wide, and 3/8 inch thick. It was heavily framed with ash. In order to keep the back from warping out of shape, I had it made of thoroughly seasoned ash strips 1" x 1". Each strip was carefully planed, and then they were glued and screwed together, while across the ends were fastened strips with their grain running transversely. This back was then covered on side next to the glass with four thicknesses of common gray blanketing. Instead of applying the holding pressure by thumb cleats at the periphery, it was effected by two long pressure strips running across the back placed at about one quarter the length of the frame from the ends, and held by a screw at the center. The ends of these strips were made so as to fit in slots in the frame at a slight angle, so that as the pressure strips were turned it gave them a binding pressure at the same time. In other words, it is the same principle as is commonly used to keep backs in small picture frames. This arrangement, instead of holding the back at the edges only, and so allowing the center to fall away from the glass, distributed it evenly over the whole surface and always kept it in position. The frame was run in and out of the printing room on a little railway on which it rested on four grooved brass sheaves, one pair being at one end, while the other was just beyond the center, so the frame could be revolved in direction of its length without trouble. In order to raise the heavy back, I had a pulley-wheel fastened to the ceiling, through which a rope passed, with a ring that could be attached to a corresponding hook at the side of the back, in order to hoist it or lower it. Although that is an extremely large apparatus, yet by means of the above device it was worked easily and rapidly, and gave every satisfaction.

The solution used was of the same proportions as had been adopted in the other engineering offices of the road:

Citrate iron and ammonium 1-7/8 oz.
Red prussiate potash (C.P.) 1-1/4 oz.

Dissolve separately in 4 oz. distilled water each, and mix when ready to use. But by putting mixture in dark bottle, and that in a tight box impervious to light, it can be kept two or three weeks.

In some frames used at the School of Mines for making large blue prints a similar device has been in use for several years. Instead, however, of the heavy and cumbrous back used by Mr. Parsons, a light, somewhat flexible back of one-quarter inch pine is employed, covered with heavy Canton flannel and several thicknesses of newspaper. The pressure is applied by light pressure strips of ash somewhat thicker at the middle than at the ends, which give a fairly uniform pressure across the width of the frame sufficient to hold the back firmly against the glass at all points. This system has been used with success for frames twenty-seven by forty-two inches, about half as large as the one described by Mr. Parsons. A frame of this size can be easily handled without mechanical aids. Care should be taken to avoid too great thickness and too much spring in the pressure strips, or the plate glass may be broken by excessive pressure. The strips used are about five-eighths of an inch thick at the middle, and taper to about three-eighths of an inch at the ends.

The formulæ for the solution given by Whittaker, Laudy, and Parsons are practically identical so far as the proportions of citrate of iron and ammonia and of red prussiate of potash, 3 of the former to 2 of the latter, but differ in the amount of water. Laudy's formula calls for about 5 parts of water to 1 of the salts, Whittaker's for 4 parts, and Parson's for a little more than 2 parts. The stronger the solution the longer the exposure required. With very strong solutions a large portion of the Prussian blue formed comes off in the washwater, and when printing from glass negatives the fine lines and lighter tints are apt to suffer. The blue color, however, will be deep and the whites clear. With weak solutions the blues will be fainter and the whites bluish. Heavily sized paper gives the best results. The addition of a little mucilage to the solution is sometimes an advantage, producing the same results as strength of solution, by increasing the amount adhering to the paper. With paper deficient in sizing the mucilage also makes the whites clearer.--_H.S.M., Sch. of M. Quarterly._

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HOUSE DRAINAGE AND REFUSE.

A course of lectures on sanitary engineering has been delivered during the past few weeks before the officers of the Royal Engineers stationed at Chatham, by Captain Douglas Galton, C.B., D.C.L., F.R.S.

The refuse which has to be dealt with, observed Captain Galton, whether in towns or in barracks or in camp, falls under the following five heads: 1, ashes; 2, kitchen refuse; 3, stable manure; 4, solid or liquid ejections; and 5, rainwater and domestic waste water, including water from personal ablutions, kitchen washing up, washings of passages, stables, yards, and pavements. In a camp you have the simplest form of dealing with these matters. The water supply is limited. Waste water and liquid ejection are absorbed by the ground; but a camp unprovided with latrines would always be in a state of danger from epidemic disease. One of the most frequent causes of an unhealthy condition of the air of a camp in former times has been either neglecting to provide latrines, so that the ground outside the camp becomes covered with filth, or constructing the latrines too shallow, and exposing too large a surface to rain, sun, and air. The Quartermaster-General's regulations provide against these contingencies; but I may as well here recapitulate the general principles which govern camp latrines. Latrines should be so managed that no smell from them should ever reach the men's tents. To insure this very simple precautions only are required:

1. The latrines should be placed to leeward with respect to prevailing winds, and at as great a distance from the tents as is compatible with convenience. 2. They should be dug narrow and deep, and their contents covered over every evening with at least a foot of fresh earth. A certain bulk and thickness of earth are required to absorb the putrescent gas, otherwise it will disperse itself and pollute the air to a considerable distance round. 3. When the latrine is filled to within 2 ft. 6 in. or 3 ft. of the surface, earth should be thrown into it, and heaped over it like a grave to mark its site. 4. Great care should be taken not to place latrines near existing wells, nor to dig wells near where latrines have been placed. The necessity of these precautions to prevent wells becoming polluted is obvious. Screens made out of any available material are, of course, required for latrines. This arrangement applies to a temporary camp, and is only admissible under such conditions.