Chapter V: Part 5

In the period referred to all the work was done by hand, machine spinning being of later date. American hemp was used, this softer fiber being spun by hand long after Manila hemp was spun by machines. The hand-making process, long used, is an interesting one. The first step was to “hackle” the hemp. The hackle was a board with long, sharp steel teeth set in it. This combed out the matted tow of the hemp into clean, straight fiber. The instrument used in spinning was a large wheel, turned by hand, and setting in motion a set of “whirls” or revolving spindles, which twisted the hemp by their motion. The spinner wrapped a quantity of the hackled hemp around his waist and attached some of the fibers to the whirls, which twisted the hemp as he walked backward down the ropewalk, pulling out new fiber from his waist by one hand and pressing it into form and size with the fingers of the other.

In forming a small rope, two of the yarns thus formed were twisted together in a direction opposite to that of the first twist. Then a second twisting followed, the direction being again reversed. Thus rope making may be seen to consist in a series of twisting processes, each twist opposite to the former, the rope growing in size and strength at each operation. Horse power or water power was used when the ropes became too large to be made by hand.

Machine-made Ropes.

The old ropewalk is today largely obsolete, the rope-making machine taking the place of the hand-making process, which was not adapted to produce the large cables which in time were called for. Steam-driven machines were first introduced about 1838. These are now used alike in making fine threads and yarns and in large ropes.

There are two methods in the modern system of rope making. In one the strands are formed on one type of machine and twisted into a rope on another. In the second method both operations are performed on a single machine. The latter saves space, but is not so well fitted for large ropes as the former. A plant for the two-part method comprises two or more horizontal strand-forming machines, several bobbin frames, and a vertical laying-machine. The former twists several strands into a rope, the latter several ropes into a cable.

The yarns, which are wound around bobbins, are drawn from them through perforated plates, these so placed that the yarns converge together and pass into a tube. In this they are compressed and at the same time twisted by the revolution of a long carriage or flyer, which can be made to vary in speed and direction. After being twisted the strands are wound around reels in readiness for the second, or laying process.

In this the full reels are lifted by overhead chains and are placed in the vertical flyers of the laying-machine. Here again the strands are made to pass through openings and converge into a central tube, through which they pass to the revolving flyers, which perform the final duty of twisting them into rope. The finished product is delivered to a belt-driven coiling reel on which it is wound.

The most complete rope-making machine yet reached is that in which these two machines are combined into one. It economizes space, machinery and workmen, and also is more rapid in reaching the final result. But there are disadvantages which render it unfit for the larger sizes of rope, and it is therefore used only on a limited range of sizes.

American Hemp.

Among the fibers employed in rope making that of the hemp plant long held the supremacy, though in recent years it has been largely supplemented by other and stronger fibers. This plant is a native of Asia, but is now grown largely in other continents, taking its name from the country in which it is raised, as Russian hemp, Italian hemp, and American, or Kentucky, hemp, it having long found a home in the soil of Kentucky. It differs from the Manila fiber, which has now very largely supplanted it, by being much softer, though of less strength. In the old days of the sailing vessel hempen rope was largely used for the rigging of merchant and war ships, but the use of other fibers and of wire for rigging has greatly reduced the market for Kentucky hemp. There are various other fibers known under the name of hemp, the New Zealand, African, Java, etc., but the Manila and Sisal fibers, since the middle of the last century, have largely taken their place.

1. Building the kiln.
2. Starting fire.
3. Racking back coals.
4. Tar coming from kiln.
5. Dipping and barreling.
6. Working around kiln.
7. After hard day and night.
8. Tar makers at home.
9. Burning completed.]

Manila and Sisal Fibers.

Manila hemp, as it is called, is a product of our Philippine dependency, being obtained from a species of the banana plant which grows abundantly in those islands. Its fiber is very long, ranging from six to ten feet, and is noted for its smoothness and pliability, a feature which makes it ideal for rope making. Gloss and brilliancy are also characteristics of good quality Manila.

Manila hemp is obtained from the leaf stalks of the Philippine plant known as the Abacá, the leaf stems of which are compressed together, and constitute the trunk of the plant. It is obtained by scraping the pulp from the long fibers, drying these when thoroughly cleaned, and baling them for market.

The high price of the Manila product, however, has brought a cheaper fiber, of American growth, into the market; this being that known as Sisal, extracted from henequen, a cactus-like plant of Yucatan. As a substitute for or rival of Manila hemp it has come into common use. Its cheapness recommends it despite the fact that it is not of equal strength, and also that its fibers are shorter, being from two to four feet in length. Sisal also lacks the flexibility of Manila, being much more stiff and harsh. The development of the self-binding reaper on our western grain-fields has opened a gold mine for Sisal cordage. Of the annual import of this fiber to the United States, 300,000,000 pounds in quantity, a large proportion finds its way to the wheat fields of the West. It is also used in all other wheat-yielding countries.

Henequen is now grown on large plantations, the plant being about five years old before the long, sword-like leaves are ready to cut. It continues to yield a supply for ten or twenty years, this lasting until the flower stalk, or “pole,” appears, after which the plant soon dies. As Manila fiber is at times adulterated with Sisal, so has the latter its adulterant in a plant called Istle, which grows in Mexico and has hitherto been chiefly used in brush making.

These are the chief plants used in rope making. To them we may add coir, obtained from the brush of the cocoanut, which has been long used in India, and has come into use in Europe in recent years. It is fairly strong and has the advantage of being considerably lighter than hemp or Manila. And, unlike these, it does not need to be tarred for preservation, as it is not injured by the salt water. Two other rope-making fibers of importance are the Sunn hemp of India and cotton, ropes of the latter being largely used for certain purposes, such as driving parts of textile machinery.

Wire Ropes.

We have not completed the story of rope making. There is the wire rope to consider, a kind of cordage now largely used in many industries, in which it has superseded hemp ropes and chains. These seem to have originated in Germany about 1821. In the bridge at Geneva, built in 1822, ropes of untwisted wire, bound together, were used, and some fifteen years later “stranded” wire ropes were employed in the Harz mines. These at first were made of high-class wire, but only steel is now used in their manufacture. A strand of wire rope generally consists of from six to nine wires and sometimes as many as eighteen, but much larger ropes are made by twisting these strands together. They are generally galvanized to prevent them from rusting.

The applications of wire ropes are very numerous, an important one being for winding and hauling purposes in mines. For aerial ropeways they are extensively employed, and are of high value in bridge building, the suspension bridge being sustained by them. The strength of the steel wire used for ropes varies from seventy to over one hundred tons per square inch of sectional area, the weight of a hemp rope being about three times that of a wire rope of equal strength.

Pine Tar for Ropes.

Who does not know of the tarred rigging that once meant so much to the rope maker? Its very odor seems to cling to the pages of seafaring books. When steam power took the place of wind power in ships the use of tarred rigging naturally declined, yet tarred goods still form an important branch of the rope business. Pine tar is the kind best suited for cordage, the yellow, longleaf, or Georgia pine holding the first rank in the United States for tar making. This tree is found along the coast region from North Carolina to Texas.

In tar-kiln burning only dead wood is used, the green tree yielding less tar and of lower quality. It is a slow process, as a brisk fire would consume the wood without yielding tar. As the tar comes from the kiln it is caught in a hole dug before the outlet and is dipped up and poured into barrels, the average yield being one barrel of tar to the cord of wood. As above said, it is indispensable to protect cordage exposed to the effects of moisture, except in the case of coir ropes. Oiling is also an important process in the manufacture of ropes from hard fibers, as Manila, Sisal and New Zealand. This softens them and makes them more workable, and it also acts as a preservative.

Why does Rope Cling Together?

This is probably due to a degree of roughness in the surface of fibers, often imperceptible to the eye, yet preventing them when in close contact from slipping easily upon each other. This is greatly increased by twisting the fibers together, and is added to by the toughness of the fibers themselves, the whole giving to rope a great resisting power. In the case of wire rope it is the firmness with which the metal holds together that gives it its great resisting strength. It is also not unlikely that the pressure of gravitation takes part in rope making, by holding the fibers in close contact, even if we do not know how this force operates.

What is Rope Used for?

This is a question that has already been answered in great part. Its uses, in fact, are innumerable. It serves to hold things together, and also to hold them apart; to lift things into the air and to hold them down to the ground; to pull things forward and pull things back--but not to push things forward. For the latter something less flexible than rope is needed. Animals are tied or tethered by it and led by it, and man, himself, is one of its victims. This is especially the case in the dismal way in which man’s career upon earth has so often been ended by lifting him from the ground by the aid of a rope loop around his neck. It is of some comfort to know that this brutal use of the rope is being replaced by more humane methods of ending the lives of condemned criminals.

* * * * *

How did the Expression “A-1” Originate?

We have all become so accustomed to hearing the term “A-1” used to designate a thing as perfect that it does not occur to many of us to wonder how it originally came to be used in that connection. Its first use was as a symbol in the code by which vessels were graded in the register of shipping kept by Lloyd’s, the originators of marine insurance. “A-1” was the best rating given to the highest class vessels, “A” standing for perfect condition of the hull of the ship and “1” meaning that the rigging and whole equipment was complete and in good order.

How has Man Helped Nature Give Us Apples?

The original of all the varieties of the cultivated apple is the wild crab, which is a small and extremely sour fruit, and is native of most of the countries of Europe. We use the crab-apple for preserving even now, although man’s ingenuity has succeeded in inducing nature to give us many better tasting kinds.

The amazingly large number of different varieties which we have today have all been brought into existence through the discovery of the process of “grafting.” There are a half a dozen or more different methods of grafting. The method most commonly practiced in working with apple trees is called “bud-grafting,” and consists of transferring a plate of bark, with one or more buds attached, from one tree to another.

The wood of apple trees is hard, close-grained and often richly colored, and is suitable for turning or cabinet work. Apple-growers classify apples into three different kinds, each consisting of a great many separate varieties. The three general divisions are--table apples, which are characterized by a firm, juicy pulp, a sweetish acid flavor, regular form and beautiful coloring; cooking apples, which possess the quality of forming by the aid of heat into a pulpy mass of equal consistency, and also by their large size and keeping properties; and cider apples, which have a considerable astringency and a richness of juice.

The Rogue River Valley, Oregon, in one section of which this photograph was taken, is known all over America for its wonderful apples. One apple-raiser in this district gathered two hundred bushels of apples per acre from his six-year-old trees.]

What Kind of a Crab Climbs Trees?

Besides the water-crabs that we are most of us used to seeing and eating, there are several different kinds of land-crabs. Probably the most interesting of them all is the great Robber-crab, which is found on certain islands of the Pacific. He is a creature of immense strength and climbs palm trees in order to pick, and break open, the cocoanuts. He lives in a den which he digs for himself in the ground.

Darwin gives an interesting description of these extraordinary animals: “I have before alluded to a crab which lives on cocoanuts; it is very common on all parts of the dry land, and grows to a monstrous size. The front pair of legs terminate in very strong and heavy pincers, and the last pair are fitted with others weaker and much narrower. It would at first be thought quite impossible for a crab to open a strong cocoanut covered with husk, but Mr. Liesk assures me that he has repeatedly seen this effected. The crab begins by tearing the husk, fiber by fiber, and always from that end under which the three eye-holes are situated. When this is completed, the crab commences hammering with its heavy claws on one of the eye-holes till an opening is made. Then turning round its body, it extracts the white albuminous substance with its posterior and narrow pair of pincers.

“Every night it is said to pay a visit to the sea, no doubt for the purpose of moistening its gills. The young are likewise hatched, and live for some time, on the coast. These crabs inhabit deep burrows, which they hollow out beneath the roots of trees, and there they accumulate surprising quantities of the picked fibers of the cocoanut husk, on which they rest as a bed. To show the wonderful strength of the front pair of pincers, I may mention that Captain Moresby confined one in a strong tin box, the lid being secured with wire; but the crab turned down the edges and escaped. In turning down the edges, it actually punched many small holes through the tin!”

How are Files Made?

A good tool-kit holds a number of files of various shapes. Some are flat, others half-round, three-sided, square and round. They are generally thickest in the middle, while their teeth are of various degrees of fineness and of different forms.

A file whose teeth are in parallel ridges only is called single-cut or float-cut. Such are mostly used for brass and copper. When there are two series of ridges crossing each other the file is double-cut, which is the file best suited for iron and steel.

Rasps are files which have isolated sharp teeth separated by comparatively wide spaces, and are chiefly used for soft materials such as wood and horn.

Each of these three classes of files is made in six different degrees of fineness, the coarsest being called rough, the next middle, followed by bastard, second-cut, smooth and superfine or dead-smooth, each a degree finer than that which precedes it.

Files are usually made with the hand, file-cutting machines not having been as yet perfectly successful on account of the delicacy of touch required in the work.

The blanks, as the steel before it has teeth is called, are laid on the anvil and struck with the chisel, which rests obliquely on the blank, each blow raising a ridge or tooth. The strength of the blow depends on the hardness of the metal, and when one part is harder than another the workman alters his blows accordingly. When one side is covered with single cuts if the file is to be double cut he adds in the same manner a second series, crossing the others at a certain angle.

In making fine files a good file-cutter will cut upwards of two hundred teeth within the space of an inch. The files, except those that are used for soft substances, are hardened by heating them to a cherry-red color and then dipping them in water. They are then finished by scouring and rubbing over with olive oil and turpentine.

The Story of Self-Loading Pistols[8]

Colt Pistols.

The machine gun of the present day, the murderous weapon which has numbered its victims by the hundreds of thousands during the European war, had its origin in the mind of a man whose birth dates back to almost exactly one hundred years before this war began, that of Samuel Colt, born at Hartford, Conn., on July 19, 1814.

The revolver played a large part in Indian warfare.]

The small arm of the previous period, the old “Brown Bess,” used in the British army for 150 years, was a muzzle-loading, flint-lock musket of the crudest make. The only important improvement made in it during that long term of service was the substitution of the percussion cap for the flint lock. This took place in the last period of its use. A breech-loading rifle was also invented about this time. This was the “Needle Gun,” of which 60,000 were issued to the Prussian army in 1841, and which was first used in 1848, in the German war with Denmark.

The Colt pistol had appeared before this date. The idea of it grew in the mind of young Colt when he left his father’s silk mill and shipped as a boy sailor in the ship “Carlo,” bound from Boston to Calcutta. While on this voyage the conception of a revolving pistol came to him, and he whittled out a rude model of one with a penknife from a piece of wood.

When he returned he sought in vain to interest his father and others in his idea of a pistol with a revolving cylinder containing six chambers to be discharged through a single barrel. This boyish notion won no converts, and at the age of eighteen he went on a lecture tour on chemistry, under the dignified title of Dr. Coult. These lectures met with success, and he used the money made by them in developing his pistol, which was in a shape to patent by 1835. Patents were taken out by him in this and the following year in the United States, Britain and France, and in 1836 he established the “Patent Arms Company” at Paterson, N. J., with a paid-in capital stock of about $150,000. This was a bold move by the young inventor, then just escaped from boyhood.

Young Colt tried in vain to interest government officials in his new weapon, their principal objection being that he used in it the new percussion caps instead of the time-honored flint-lock. But success came during the Seminole War of 1837, when some of the officers, who had seen the new revolving pistol, decided to give it a trial and sent to the factory for a supply.

Its value was soon proved. The Indians looked on this weapon that could be fired six times after one loading, as something magical. It was too much for their philosophy and the war soon came to an end. At a later date it was used by the Texans in their war against Mexico, and from that time on every Texas ranger wanted a revolver. It has ever since been the favorite weapon of the cowboy and frontiersman.

In this model the slide remains open after firing the last cartridge. When reloading the arm in this position, insert the magazine, then press downward the slide stop (to the rear of the trigger as illustrated). The slide goes forward, inserting a cartridge without any movement of the slide by hand. The slide stop is operated by the thumb of the hand holding the pistol.]

Adopted by the Police Departments of the principal cities of the United States and Canada.]

The action of this pistol is automatic except that the trigger must be pulled to fire each shot; continued discharge will not result from one pull of the trigger.]

But wars ran out, the market closed, and the “Patent Arms Company” failed. What put Colt on his feet again was the Mexican war a few years later. General Taylor offered Colt a contract for one thousand revolvers at $24 each, and though the young inventor was looked upon as a ruined man he took the contract, got together the necessary capital, and built a factory on the Connecticut at Hartford. From that time on there was no want of a market. The “Forty-Niners” took revolvers to California, foreign governments sent orders for them, and armories were built in England and in Russia for their manufacture. Colt died in 1862, but the Civil War had previously opened a great market for his pistols, and before the conflict ended the Colt factory at Hartford was in a highly flourishing state. In the following years the revolver became a prime necessity in dealing with the Indians of the West, and a school-book statement of that date was to the effect that: “The greatest civilizer of modern times is the Colt revolver.” Another writer, speaking of the “Peacemaker,” an effective weapon produced after 1870, said: “It has the simplicity, durability, and beauty of a monkey-wrench.”

Machine Guns.

The revolving idea was applied to guns about 1861 by Richard J. Gatling, the first Gatling guns fitted for use with metalling ammunition being produced by the Colt Company in 1870. These guns had ten barrels revolving around a central shaft and in their developed form were capable of being fired at the rate of one thousand shots a minute. The first of these to be used prominently in warfare was the French mitrailleuse, used by France in the war of 1870-71. The Gatling soon made its way widely, and its rapidity of fire became a proverb. If anything moved quickly it was said to “go like a Gatling” or “sound like a Gatling.”

Other guns of this type are the Hotchkiss, the Nordenfeldt and the Gardner, and a more recent one is the Maxim, which, after the first shot is fired by hand power, continues to fire shot after shot by means of the power derived from the explosion of each successive cartridge. In the early form of the revolver the empty cartridge cases had to be ejected from the cylinder singly by an ejector rod or handy nail. In 1898 a new type was introduced with a lateral swinging cylinder which permitted the simultaneous ejection of all the empty shells.

Near the time of the Spanish-American War appeared what is known as the Colt automatic gun, operated by the action of the powder gases on a piston and lever near the muzzle of the barrel. This could be fired at the rate of 400 to 500 shots a minute, and by reason of its light weight could be very easily carried. The British used it effectively in the Boer War.

Today the Colt Company manufacture revolvers in which the simultaneous ejection of the cartridge-cases and recharging of the chambers is combined with a strong, jointless frame; automatic magazine pistols in which the pressure of the powder gases, as above said, is utilized after giving the proper velocity to the projectile, it requiring only a slight continued pressure on the trigger for each shot; automatic machine guns firing at will single shots or volleys while requiring only a slight pull upon the trigger; and the improved manually-operated Gatling gun firing the improved modern ammunition. The cartridges are carried on a tape which feeds them with the necessary rapidity into the barrel.

What would be the history of the European War without the machine gun is not easy to state, but as a highly efficient weapon of war its quality has been abundantly proved.

* * * * *

How does the Poisonous Tarantula Live?

When the National Guardsmen from all over the Union were concentrated along the Mexican border, many reports were sent home of thrilling experiences with tarantulas, to whose bite the natives of Mexico, Italy and many other warmer countries have ascribed a disease called “tarantism.” The Italian peasants believe that this disease can only be cured by a certain kind of music.

The tarantula, like many other members of the spider family, is an expert in the making of burrows. Its burrows are artfully planned. At first there is a sheer descent four or five inches in depth, but at that distance below the surface the tunnel turns aside before dipping straight down again to its termination. It is at the angle or elbow of the tunnel that the tarantula watches for the approach of enemies or prey, like a vigilant sentinel, never for a moment off its guard, lying hidden during the day, if nothing disturbs it, and coming out at nightfall to seek its prey.

Unlike most other spiders, it hunts its game without the aid of webs or snares. It does, however, possess the ability to spin the silk which we have all seen other spiders make, for, in digging its hole, it makes neat little packages of the dirt it has scraped up, bound together with silk and slime from its mouth, and flips them to one side out of the way. When it comes to hunting, it makes sure that it can pounce on its prey, by building the entrance of its hole about two inches in diameter and up from the surface an inch or so, so that it can spread its legs for the leap.

How do the Indians Live Now?

The Indians of the United States are now largely gathered into reservations and their former dress, arms and habits are being gradually changed for those of the whites. Civilization is invading their homes and driving out their older characteristics. This is especially the case with the large numbers now dwelling in the former Indian Territory, now Oklahoma, although those confined in the reservations of Arizona, New Mexico and Montana are clinging more to their old modes, as is shown in the accompanying illustrations.

In ancient times the body was covered with furs and skins according to the seasons, but now the white man’s clothes and blanket have generally superseded the native dress; though the moccasin of deer or moose hide, and, in the wilder tribes, the ornamental leggings and head-dresses are still retained. Their dwellings are made of bark, skins and mattings of their own making, stretched on poles fixed in the ground. The arms of the wilder tribes consist of the bow and arrow, the spear, tomahawk and club, to which have been added the gun and knife of the whites. Canoes are made of logs hollowed out, or of birch bark stretched over a light frame, skilfully fastened with deers’ sinews and rendered water-tight by pitch.

The Apaches, formerly one of the most powerful and warlike of the Indian tribes, are now confined to reservations in Arizona and New Mexico.]

Blackfeet Indians in camp on St. Mary Lake.]

The American Indian is described as of haughty demeanor, taciturn and stoical; cunning, brave and often ferocious in war; his temperament poetic and imaginative, and his simple eloquence of great dignity and beauty. They have a general belief in Manitous, or spiritual beings, one of them being spoken of as the Great Spirit. They believe in the transmigration of the soul into other men and into animals, and in demons, witchcraft and magic. They believe in life after death, where the spirit is surrounded with the pleasures of the “happy hunting grounds.” They adopt a “totem” or symbol of the family and this is generally some animal, the turtle, bear and wolf being favorites.

The number of Indians in the United States at the taking of the Federal Census in 1910, was 265,683; and there are about 130,000 in the British possessions, 1,500,000 in Central America and 4,000,000 in Mexico. In all North America there are somewhere about 6,000,000 and there are probably 10,000,000 more in South America, many of them being more or less civilized.

How does the Beach Get Its Sand?

Most of the sands which we find on the beaches and in other places are the ruins of rocks which have come apart, usually as the result of the action of water. A large part of the ocean bottom is made up of “sandstone” and the continual washing of the water over this causes particles to break away and float off, whereupon they are swept up upon the beaches by the waves.

Sands differ in color according to the rocks from which they are derived. In addition to the sands on the beaches, they occur very abundantly in many inland locations, which were formerly sea bottoms, and very extensively in the great deserts of the world.

Valuable metallic ores, such as those of gold, platinum, tin, copper and iron, often occur in the form of sand or mixed with that substance. Pure siliceous sands are very valuable for the manufacture of glass, for making mortar, filters, ameliorating dense clay soils, for making molds in founding and for many other purposes.

The silica, which is the principal ingredient of sand, as well as of nearly all the earthy minerals, is known as “rock crystal” in its naturally crystallized form. Colored of a delicate purple, these crystals are what we call “amethysts.” Silica is also met with in the “carnelian” and we find it constituting jasper, agate, cat’s-eye, onyx and opals. In the latter it is combined with water. Many natural waters present us with silica in a dissolved state, although it is not soluble in pure water. The resistance offered by silica to all impressions is exemplified in the case of “flint” which consists essentially of silica colored with some impurity.

How did Nodding the Head Up and Down Come to Mean “Yes”?

Like a multitude of other things, the signs which we give by the movements of our heads to indicate “yes” and “no” were copied from animal life.

When the mother animal brought her young a choice morsel of food she would hold it up temptingly before its mouth and the quick forward movement of the head, with mouth open, showed the young animal’s desire and acceptance of the offer. Even today when we make a forward movement of our heads to indicate “yes” it is observed that the lips are usually quite unconsciously opened a little.

In much the same manner, when the young had been well fed and were no longer hungry, a tightly closed mouth and a shaking of the head from side to side were resorted to, to keep the mother from putting the food into their mouths. Our natural impulse now is to slightly clinch our teeth when we shake our heads to mean “no.”

Why do We Call a Man “a Benedict” When He Marries?

We call men “benedicts” when they become married because that was the name of a humorous gentleman in Shakespeare’s play, “Love’s Labor Lost,” who was finally married to a character named “Beatrice.”

The Story in Firecrackers and Sky-Rockets[9]

The blaze and noise, indispensable to patriotic celebrations among all peoples, was produced a century ago in America by simple agencies. Washington’s Birthday was ushered in by cannon salutes in every garrisoned place in the United States, and boys the country over built bonfires as they still do in old New England towns to celebrate the day. But the Fourth of July was the great hurrah time of the year, when every youth who owned a gun or could borrow one, brought it into use as a contribution to the general noise. He might lack shoes and be short of shot and bullets for hunting, but for this occasion no young man was so poor as to have failed to lay in a hornful of powder, and at the stroke of twelve midnight, which began the day, he and his companions blazed away with guns loaded to the danger point, and kept up their fusillade as long as ammunition lasted. For demonstrations on a larger scale, a small cannon was secured if possible, but lacking this, two blacksmith’s anvils were made to do the same service, the hole in the top of one being filled with powder, a fuse laid into it and the second anvil placed as a stopper upon the first before the charge was exploded.

A favorite firearm for celebration purposes was one of the old “Queens Arm” muskets which were common in country communities, being trophies captured from the British during the Revolutionary War. One of these cumbersome flint-lock pieces might be loaded halfway to the muzzle and fired without bursting, and would roar in the discharge in a way highly pleasing to patriotic ears.

It was near the close of the eighteenth century that Chinese firecrackers first came into use in celebrating the American Independence Day. For many years they were used sparingly and only in large cities. They had been known in the New England coast cities ever since the year 1787, when Elias Haskett Derby’s ship of Salem, the first American vessel to engage in deep-water commerce, returned from her voyage to Calcutta, China and Isle of France. Among the things she brought back--more as a curiosity than as an article of cargo--was a consignment of Chinese firecrackers. Their capabilities in aiding the uproar on the Fourth of July were quickly recognized, and thereafter every ship that made the voyage from Massachusetts Bay to India or China brought back firecrackers with the tea, silks and rice. In time, rockets, squibs and torpedoes were included in the consignment, but it was not until the middle of the nineteenth century that their use became general in America.

The time when the more complicated fireworks, which we owe both to Europe and the Orient, came into vogue in this country, no one perhaps could now definitely tell. Their use was known to our seafaring men in the “forties,” for it was in that decade that Capt. Decimus Forthridge, of the American brig “Independence,” showed his Yankee pluck and resource in defeating an attack of Malay pirates with no other armament than fancy fireworks. During his voyage in the East Indies he had laid in a supply of fireworks with which to celebrate the Fourth of July in a manner worthy an American captain. For some reason no ammunition was available for swivels or muskets, when, in the mid-watch of the night, two war proas, deeply laden with armed Malays, were seen coming quickly up on the vessel’s quarter as she lay becalmed off Firabader Point in the Island of Sumatra. The cry of “All hands on deck to repel pirates” brought the crew on deck in haste, but without ammunition the chance that they would beat the enemy off was a long shot compared with the probability that the throat of every man on board would be cut as a preliminary to plundering and scuttling the vessel. Even in their extremity the crew laughed and jeered when the captain ranged them along the quarter rail with boarding pikes and empty muskets in hand to give the enemy the idea that they were ready for business, and then, opening the box of fireworks, he began to shoot rockets and roman candles at the pirates. If the crew laughed, the Malays did not, and when the captain of one of the proas was struck by a rocket, both crafts rested oars and came no nearer. But while Captain Forthridge was attending to these, a third proa came up unobserved under the port quarter, and the first that was known of its presence was the attempt of its occupants to board the vessel by the chains. To make matters worse it was discovered that the paper wrappings of the fireworks in the box were on fire. While the crew with clubbed muskets and boarding pikes kept the Malays outside the rails, Captain Forthridge picked up the blazing box, carried it to the chains, and while the mate and sailors warded the spears and krises from him, dropped it into the proa. The box was blown to pieces the minute it struck, scattering the fireworks through the proa, and with firecrackers snapping and jumping and fiery serpents running round among their bare legs, the Malays chose to take their chances with the sharks, and all hands went overboard into the water at double-quick. A little breeze came up and the brig drew away from the pirates, leaving the two proas to pick up those Malays from the water that the sharks had missed.

In the days of the China clippers, those famous ships sailed many a race from Hong Kong and Canton, with New York as the goal, to get there with “first tea” and to forestall the Fourth of July market with a cargo of firecrackers.

In China and the East Indies, fireworks, like “the fume of the incense, the clash of the cymbal, the clang and the blaze of the gong,” are a part of the worship of the gods, as well as a feature of coronations and weddings. China is the birthplace of fireworks. From China the knowledge of them spread to India, and in both these lands rockets were used as missiles of war as early as the ninth century. The Chinese war rocket was a long, heavy affair, fitted at the end with a barb-like arrow, and to a foe unacquainted with firearms, it must have seemed a formidable missile. After gunpowder was introduced in Europe, fireworks came into use on the continent, and the use of both explosives undoubtedly was learned from the Chinese.

Fireworks were manufactured in Italy as early as 1540, and in France we have accounts of their employment in great celebrations between the years 1606 and 1739. Long before this time, some form of rocket, now unknown, that would burn in water, constituted the famous Greek fire which struck terror to the hearts of invaders from Northern Europe in medieval times when the Saracens launched it against their ships. Early in the present century during the Napoleonic Wars, the rocket perfected by Sir William Congreve was used in the siege of Boulogne and in the battle of Leipsic. The conditions of modern warfare have so changed that the rocket is no longer of practical use in fighting except as a signal. In case of shipwreck it is often employed to carry a line from the shore to a stranded vessel. It is noteworthy that while almost every kind of fireworks is manufactured in Europe and the United States, the small firecrackers are still imported from China. But larger quantities are now manufactured in the United States, and it is only a matter of time when the “Young American” salute will take the place of the Chinese firecrackers.

It was about ten years before the Civil War that “set pieces” began to form a part of fireworks celebrations. In those days the most famous pyrotechnic display in the whole country was given on Boston Common on the Fourth of July, and the country boy who was so lucky as to see that display, with the miracle of George Washington’s benign face illuminated amid spouting flames and a shower of fireballs and rockets, had something to talk about for the rest of the year.

The American Civil War which did so much toward the modern development of firearms and munitions of war, brought also a great advance in pyrotechny, and soon after the close of the struggle, extensive manufacture of fireworks began in this country, with New York as the headquarters of the principal firms engaged in the business.

In 1865 the first displays of fireworks in the United States, illustrating historical events, were made by a company in New York City. They were the pioneers in this line of displays. Their success was immediate, and from these displays has grown the successes of today in pyrotechnics.

Fireworks now enter into the celebration of every important event in our national, political and business life. The celebrations at Washington, D. C., at the inaugurations of our Presidents, the coronations of emperors and kings in lands beyond our borders, are all brought to a close by brilliant displays of fireworks.

The writer, in visiting the plant of a large fireworks manufacturer, found that they were turning out large quantities of time fuses and primers for shrapnel shells for the foreign powers, and are working night and day on orders for the United States government on aeroplane bombs and signals. They have also worked out a searchlight projectile which is arranged to burst in the air, throwing out a number of luminous bodies that light up the surrounding country and reveal the movements of the enemy.

All large displays of fireworks are now fired by electricity and every known color and effect is produced by the pyrotechnist of the present day.

The water displays are scarcely less varied, consisting of flying fish, diving devils, prismatic fountains, floating batteries, fiery geysers and submarine torpedoes, all of which, being ignited and thrown into the water, go through their stunts as readily as other kinds do on land and in the air.

From every part of the civilized world, from Mexico, Central and South America and Europe, orders for fireworks come in increasing numbers to American firms, who now lead the world in this art. The Philippines will soon be a customer for them, and with the general opening up of China to modern civilization, from causes now in operation, it will not be strange if some day we should supply fireworks to the land of their origin.

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What Makes a Chimney Smoke?

Smoky chimneys are usually caused either by the presence of other buildings obstructing the wind and giving rise to irregular currents of air, or by improper construction of the fireplace and adjacent parts of the chimney.

The first may generally be cured by fixing a chimney-pot of a particular construction, or a revolving cowl, on the chimney top, in order to prevent the wind blowing down; in the second case the narrowing of the chimney throat will generally create a better draft.

The longer a chimney is, the more perfect is its draft, provided the fire is great enough to heat the column of air in it, because the tendency of the smoke to draw upwards is in proportion to the difference of weight between the heated air in a chimney and an equal column of external air.

The first we hear of chimneys, for the escape of the smoke from a fire or furnace, is in the middle ages.

This dry dock, which is capable of floating the largest battleship, was towed from Sparrow’s Point, Maryland, to Olangapo, Philippine Islands, a voyage of 13,000 miles. In operation, the dock is sunk by admitting water into its tanks until the ship can be floated in. The water is then pumped out and the dock with the ship inside rises to the proper level as shown.]

What are Dry Docks Like?

Although divers are able to go down under the water to examine the bottom of a ship while it is afloat, it is usually necessary to have it up on dry land when thorough inspections or repairs have to be made. So a berth something like a huge box stall in a stable is built, with the part where a horse would stand in the stall full of water, and a door, either made like swinging gates opening in the middle, or a caisson which is operated up and down like a window, at the end. The ship is floated into the dock and then after the door is shut to prevent any more coming in, all of the water is pumped out until the vessel rests on a lot of great big wooden blocks and supporting props with which the bottom and sides of the dock are lined. Supports are also placed between the vessel and each side of the dock. Then, when the work has been finished, and the ship is ready to go to sea, water is let back either by pumping it in or else by gradually opening the door at the end, and the vessel is able to float out into the river or harbor again.

Although all of the navy yards and some private corporations in this country have docks of this kind, they are not of as much importance here as in England, where they are used, without pumping out the water, for the loading and unloading of vessels, because of the very great rise and fall of the tides there straining and otherwise damaging ships tied up to ordinary docks.

There are nine important navy yards in the United States, located at Brooklyn, N. Y.; Boston, Mass.; Portsmouth, N. H.; Philadelphia, Pa.; Portsmouth, Va.; Mare Island, Cal.; New London, Conn.; Pensacola, Fla.; Washington, D. C., and Port Orchard, Wash.

There is another kind of dry dock, called “floating docks,” which float on the surface of the water and may be sunk sufficiently to allow of a vessel being floated into them, and then raised again by pumping the water out of the tanks around the sides. They are usually built of iron, with water-tight compartments, and not closed in at either end. They are sunk to the required depth by the admission of water into so many of the compartments, till the vessel to be docked can float easily above the bottom of the dock, and then they are raised by pumping out the water until the ship can be propped up as in the land dry dock.

Why does a Lightning Bug Light Her Light?

The lightning bugs or fireflies which are seen so often on summer evenings in the country and among the trees in the parks of the city, are similar to the species of beetle called the glowworm in Great Britain, although the glowworm there does not give as much light as the firefly in America.

In reality it is only the female which is the lightning bug, for the male is not equipped with any lighting power. He has the bad habit of going out nights, and so the female has had to make use of her ability to make part of her body shine with a sort of a phosphorus green light in order to show him the way home, very much as a dweller in a poorly-lighted street keeps a light in the window or on the porch to guide visitors or the late home-comer to the proper house. She seems to possess the power of moderating or increasing the light at will.

The most brilliant fireflies are found only in the warmer regions of the world. The ordinary firefly to which we are accustomed gives off a very much brighter light if placed in warm water. Fine print may be read by the light of one kind which is found in the West Indies; in Cuba the ladies have a fashion of imprisoning them in bits of netting or lace of a fine texture and wearing them as dress ornaments, and in Hayti they are used to give light for domestic purposes, eight or ten confined in a vial emitting sufficient light to enable a person to write.

The Story in the Making of a Picture[10]

Let us suppose, for the purposes of explanation, that as far as _seeing_ goes, any object is made up of countless infinitesimal points of light, and that the business of the eye is to gather them in and spread them out at the back of the eye in exactly the same relation they bore to each other on the object. The points of light, so duplicated, would thus form the image of the object.

The camera works very much the same way. The lens at the front of the camera is the eye, and the plate or film at the back of the camera corresponds to the back of the eye. The lens collects all the points of light of the object we wish to photograph, and directs them to the plate or film in such fashion that they occupy exactly the same relative position that they did before. An image of the object is formed.

Now if we could look inside the camera and the image were visible, we would see that it was upside down. The reason for this is very simple, as the accompanying diagram shows. The ray of light from “A” at the bottom of the object passes through the lens at an angle, and continues in a straight line until interrupted by the film or plate. It started at the bottom of the object and ended at the top of the image. The position of all the points of light is just reversed, although their relative position remains the same.

“Then here,” you say, “is where your analogy between the camera and the eye falls down.”

Not at all. It is true that we do not see things upside down, but this is because of mental readjustment during the passage of the impressions from the eye to the brain.

Now let us suppose that we have our camera loaded with film, and that mother has succeeded in keeping the baby quiet long enough for us to uncover the lens for an instant and let the points of light through to the film. The next question is, how are we going to make the resulting image permanent. We know that it is there, but in its present state it is not going to do us a great deal of good. In fact, if we should peek in the back of the camera, and to do so would ruin the exposure, we could not even see it.

But let us go back a bit. We ought to know a little something about the composition of this film on which the image has been projected.

In brief, film is a cellulose base coated with silver bromide and gelatine. If we were using a plate the only difference would be that instead of cellulose as a base we would have a sheet of glass. The gelatine is there to afford lodgment to this sensitized silver. The silver, being sensitive to the action of light, is there to record the image. As soon as one of these silver particles has been touched by light, it becomes imbued with the power of holding whatever the lens has transmitted to it. The image was formed, we remember, by points of light grouped in the same relative positions as the points of light of the object we were photographing. Consequently it is only those silver particles within the image-forming area that are affected, because that is where the light struck.

The lens, then, gathered in the points of light and dispersed them on the film so as to form an image. The silver particles held this image, but not visibly--it is a latent image, and it is the purpose of development to bring it out.