Great Inventions and Discoveries Part 9

A ma.s.s of mythological stories has come down from the days of antiquity regarding the origin of fire. The Persian tradition is that fire was discovered by one of the hero dragon-fighters. He hurled a huge stone at a dragon, but missed his aim. The stone struck another rock.

According to the story, "the heart of the rock flashed out in glory, and fire was seen for the first time in the world." The Dakota Indians of North America believed that their ancestors produced fire from the sparks which a friendly panther struck with its claws in scampering over a stony hill. Finnish poems describe how "fire, the child of the sun, came down from heaven, where it was rocked in a tube of yellow copper, in a large pail of gold." Some of the Australian tribes have a myth that fire came from the breaking of a staff held in the hands of an old man's daughter. In another Australian legend fire was stolen by a hawk and given to man; in still another a man held his spear to the sun and thus procured fire.

According to Greek mythology, fire was stolen from heaven by Prometheus, friend of men, and brought to them in a hollow stalk of fennel. As the legend runs, he took away from mankind the evil gift of foreseeing the future, and gave them instead the better gifts of hope and fire. For the bestowing of these gifts upon the human race, Prometheus was sorely punished by Zeus, king of the G.o.ds. The myth that fire was stolen from heaven by a hero is not confined to the Greeks; it is scattered among the traditions of all nations. It is not strange that primitive man should ascribe the origin of fire to supernatural causes. Before he learned how to use and control it, he must have been strangely impressed with its various manifestations--the flash of the lightning, the hissing eruption of the volcano, the burning heat of the sun, and perhaps the wild devastation of forest and prairie fires caused by spontaneous combustion.

Because of its mysterious origin and its uncontrollable power for good or ill, fire was supposed from the earliest times to be divine. The Bible tells us that the Lord went before the children of Israel in their journey from Egypt to the Promised Land in a pillar of fire by night. From the earliest hours of religious history the sun has been wors.h.i.+ped as a G.o.d. All the tribes of antiquity had a fire G.o.d. It was Agni in ancient India; Moloch among the Phoenicians; Hephaestus in Greece; Vulcan among the Romans; Osiris in Egypt; and Loki among the Scandinavians. In ancient religious belief fire and the human soul were supposed to be one and the same in substance. In some instances fire was held to be the very soul of nature, the essence of everything that had shape. "From Jupiter to the fly, from the wandering star to the tiniest blade of gra.s.s, all beings owed existence to the fiery element." This theory was believed by the Aztecs, who invoked in their prayers "fire the most ancient divinity, the father and mother of all G.o.ds." Of these ancient fire-divinities some were good and some evil; just as fire itself is both beneficent and malignant.

Among some peoples fire was used for purification from sin and the cure of disease. It also burned upon the tombs of the dead to dispel evil spirits. Greek colonists, in setting out from the mother country for the purpose of founding new homes, took fire from the home altar with which to kindle fires in their new homes. Upon some altars fires were kept constantly burning, and their extinguishment was considered a matter of great alarm. If by chance the fire that burned in the Roman temple of Vesta went out, all tribunals, all authority, all public and private business had to stop immediately until the fire should be relighted. The Greeks and the Aztecs received amba.s.sadors of foreign countries in their temples of fire, where at the national hearth they prepared feasts for their guests. In some cases amba.s.sadors were not received until they had stood close to fire in order that any impurities they might have brought should be singed away. No Greek or Roman army crossed a frontier without taking an altar whereon burned night and day fire brought from the public council hall and temple at home. The Egyptians had a fire burning night and day in every temple, and the Greeks, Romans, and Persians had such a fire in every town and village.

Among our Anglo-Saxon ancestors the ordeal by fire was one of the modes of trying cases of law. The accused was compelled to walk blindfolded over red-hot plowshares. If these burned him, he was adjudged guilty; if not, he was acquitted, for it was supposed that the purity of fire would not permit an innocent man to suffer. The custom of the North American Indians was to discuss important tribal affairs around the council fire. Each sachem marched around it thrice, turning to it all sides of his person. Among peoples in both hemispheres it has been the practice to free fields from the demons of barrenness by lighting huge fires. The fields were supposed to be made fertile as far as the flames could be seen. In Bavaria seeds were pa.s.sed through fire before they were sown to insure fertility. In some places children were held over the flame of an altar fire for purposes of purification.

Nothing has played a more important part in the history of the race than fire. Human culture began with the use of it, and increased in proportion as its use increased. For ages man felt his helplessness before fire; he did not know how to produce it, or to turn it to good account. By and by the secret was discovered; mind began to gain the mastery over this great force.

The most primitive method of producing fire artificially was by rubbing two sticks together. This method was probably discovered by accident.

Fire from friction was caused also by pus.h.i.+ng the end of a stick along a groove in another piece of wood, or by twirling rapidly a stick which had its end placed perpendicularly in a hole made in another piece of wood. Focusing the rays of the sun powerfully upon a given point by means of a lens or concave mirror, was another method used for starting fire. The story is told that when the ancient city of Syracuse in Sicily was being besieged, the great mathematician Archimedes, who was a resident of that city, set on fire the enemy's s.h.i.+ps by focusing the sun's rays upon them with a mirror. In China the burning-gla.s.s was widely used not very long ago. When iron came into use, it was employed for making fire. A piece of flint was struck against an iron object.

The concussion produced a spark, which fell into a box containing charred cotton called tinder. The tinder took fire but did not burst into flame. The flame came by touching the burning tinder with a strip of wood tipped with sulphur. This flint-and-steel method was used for producing fire until less than a century ago.

No attempt was made to produce fire by chemical means until 1805. In that year M. Chancel, a Paris professor, invented an apparatus consisting of a small bottle containing asbestos, saturated with sulphuric acid, and wooden splints or matches coated with sulphur, chlorate of potash, and sugar. The wooden splint, when dipped into the bottle, was ignited. The first really successful friction matches were made in 1827 by John Walker, an English druggist. They consisted of wooden splints coated with sulphur and tipped with antimony, chlorate of potash, and gum. They were sold at a s.h.i.+lling or twenty-four cents per box, each box containing eighty-four matches.

The modern phosphorus friction match came into use about 1833. It is not possible to ascertain precisely who the inventor was. But in that year Preschel had a factory in Vienna, Austria, for the manufacture of friction matches with phosphorus as the chief chemical. For years Austria and the States in the south of Germany were the center of the match industry. Phosphorus is still used as the princ.i.p.al chemical ingredient in the manufacture of matches. The first patent in the United States for a friction match was issued October 24, 1836, to Alonzo D. Phillips, of Springfield, Ma.s.sachusetts. The "safety match,"

which will not ignite unless brought into contact with the side of the box in which it is packed, was invented by Lundstrom of Sweden, in 1855. The match industry in Norway and Sweden has developed during the last few years with great rapidity. About sixty factories are in operation in these countries. One town alone contains six thousand matchmakers. In France the government has the sole right to manufacture matches.

Phosphorus is very poisonous, and the early manufacture of phosphorus matches was attended with loss of life and great suffering. Inhalation of phosphorus fumes produced necrosis, or decay of the bone, usually of the lower jaw. In the first years of phosphorus match making, the business was chiefly carried on by the poorer people in large cities.

The work was done in damp, foul cellars; and the peculiar disease of the bone caused by the phosphorus fumes became so widespread that the different governments drove the match factories out of the cellars and ordered that the business be conducted in better ventilated buildings.

But the discovery of red phosphorus, which never produces the disease, the use of lessened quant.i.ties of the ordinary phosphorus, and better ventilation have all combined to make the malady now very rare.

The first matches were made by hand, one by one, and were of necessity few and costly. Matches are now made and boxed by machinery. One million splints can be cut in an hour with the machinery in use. Some single manufacturing firms make as many as one hundred millions of matches in a day. With diminished cost of production have come decreased prices, so that now a large box can be purchased for a very few cents. Until about 1860 railroads in the United States would not receive matches for transportation, owing to the danger involved. The distribution before that year was mainly by ca.n.a.l or wagon. A match is a little thing, but it is one of the world's really great inventions.

CHAPTER XIV

PHOTOGRAPHY

Photography is one of the many triumphs of the human mind over time and s.p.a.ce. Thousands of miles are between you and the wonderful Taj Mahal.

You may never be able to go to it. But as the mountain would not go to Mohammed and Mohammed therefore went to the mountain, so photography brings the Taj Mahal to you. The chief struggle for civilization is with these two abstract antagonists--time and s.p.a.ce. In this struggle the achievements of photography are such as to win it a place among the world's great inventions and discoveries.

Here, again, we borrow words from the Greeks. _Photography_ comes from the Greek noun _phos_ meaning "light" and the Greek verb _graphein_ signifying "to write," already referred to several times in this volume. Photography is therefore the science and the art of writing or reproducing objects by means of light. The science of photography depends upon the action of light on certain chemicals, usually compounds of silver. These chemicals are spread upon a delicately sensitized metallic plate, which is exposed to light. The action of light fixes the object desired upon this plate, from which copies of the picture are made on paper of suitable kind.

Like most of the great discoveries and inventions, photography is not old. It had its beginning in 1777, when the Swedish chemist Scheele began to inquire scientifically into the reason and effect of the darkening of silver chloride by the rays of the sun. The first picture ever made by the use of light on a sensitive surface was made in 1791 by Thomas Wedgewood, an Englishman. The principle of the photographer's camera was discovered in 1569 by Della Porta, of Naples. To Niceph.o.r.e Niepce, a Frenchman, belongs the honor of producing the first camera picture. This was in 1827 after thirteen years of experimenting. He called his process "heliography," _helios_ being the Greek word for _sun_. His process consisted of coating a piece of plated silver or gla.s.s with asphaltum or bitumen, and exposing the plate in the camera for a time varying in length from four to six hours. The light acted on the asphaltum in such a way as to leave the image on the plate.

The predecessor of the modern photograph was the daguerreotype. It was named for its inventor, Louis Daguerre, a French scene-painter, who was born in 1789. In 1829 he formed a partners.h.i.+p with Niepce, and together they labored to advance the art of photography. The discovery of the daguerreotyping process was announced in January, 1839. The process of Daguerre consisted in "exposing a metal plate covered with iodide of silver for a suitable time in a photographic camera, the plate being afterwards transferred to a dark room, and exposed to the vapor of mercury, which develops the latent image, it being afterwards fixed.

Although this process has become almost obsolete, it was really the first which was of any practical value, and experts all agree that no other known process reproduces some subjects--for example, the human face--with such fidelity and beauty."

A little while before the daguerreotyping process was announced, Fox Talbot, a British investigator, discovered a method of making pictures by means of the action of light on chemically prepared paper instead of metal, as in the case of Daguerre. Talbot originated the terms _negative_ and _positive_ which are still used in photography.

Daguerre in France and Talbot in Great Britain had independently achieved success in producing pictures, but neither had discovered a way to make photographs permanent. In the course of time the pictures faded. In 1839 Sir John Herschel of England found a chemical process for making photographs permanent, by removing the cause for their fading. The first sunlight photograph of a human face was that of Miss Dorothy Catherine Draper, made by her brother, Prof. John William Draper, of the University of the City of New York, early in 1840.

Various chemical discoveries for improving photographs have been made by different persons from time to time, until the art of photography has now reached a high state of development. An important improvement is in the lessening of the time of exposure to light necessary for producing a photograph. Formerly hours were required, but under improved conditions only the shortest instant of time is requisite.

In 1906 a photographic paper for producing prints in color from an ordinary negative was placed on the market. This paper is coated with three layers of pigmented gelatin, colored respectively red, yellow, and blue. After being exposed to the daylight in the usual way, the paper is placed in hot water, where the image is developed. The grays and blacks of the negative are translated into the colors they represent in the object.

The brothers Lumiere of Paris have found a method of producing a photograph on a sensitive plate which, viewed as a transparency, shows the object in its original colors. No prints can be taken from this plate, and the picture cannot be viewed by reflected light, but the colors are true and brilliant.

The cinematograph is an instrument by which about fifteen photographs per second can be received on a film, each representing the photographed group at a different instant from the others. The advantages of this mode of photographing and of throwing pictures on a screen over the older methods are obvious. By controlling the rate at which the pictures are represented on the screen, movements too rapid to be a.n.a.lyzed by the eye may be made slow enough to permit observation; and, similarly, movements too slow for comprehension or rapid observation may often be quickened. The busy life of a city street, the progress of races or other compet.i.tions, many scenes in nature, and even the growth of a plant from seed to maturity, may be shown by means of a "moving picture."

Photography is a n.o.ble servant of mind and soul. It brings to us likenesses of eminent persons and objects of nature and art which perhaps we should never be able to see otherwise. It has been used in measuring the velocity of bullets and in showing the true positions of animals in motion. Photography has created the "new astronomy."

Immediately after its discovery, photography was applied to the science of the stars, and it has been ever since of incalculable service in this field of inquiry. Photographs of the moon were made as early as 1840, and much that is known to-day of the sun has been revealed by photography. So sensitive is the modern photographic plate to the influence of light, that photography has discovered and located stars which are invisible through a strong telescope. Astronomers are now engaged in making a photographic chart of the sky.

CHAPTER XV

CLOCKS

The matters of every-day life, much less the affairs of a complex civilization, could scarcely be carried on without some accurate and uniform system of measuring time. Nature herself furnishes measurements for certain divisions of time. The "two great lights" that G.o.d made, as the Bible tells us, were designed "for signs, and for seasons, and for days and for years." The revolution of the earth around the sun marks the year; the revolution of the moon around the earth determines the month; the rotation of the earth on its axis causes and measures day and night. But no object of nature distinguishes the hours of the day or the divisions of the hour.

Man requires a smaller unit of time than the day. He must divide the day into hours; the hours into minutes; the minutes into seconds. The division of the day into twenty-four hours is as old as authentic history. But the means for determining the hours and their subdivisions were at first quite crude and inefficient.

[Ill.u.s.tration: A SUN DIAL]

Perhaps the most primitive of all time-measuring devices was a stick or pole planted upright in a sunny place. The position of the shadow which it cast marked time. The sun-dial was a development of this simple device. It consisted essentially of two parts: a flat plate of metal marked off much like the dial of a modern clock or watch, and an upright piece, usually also of metal, fastened to the center of the dial. To make the direction of the shadow uniform for any given hour throughout the year, the upright piece was made parallel to the axis of the earth. As the earth rotated on its axis the shadow cast by the upright piece moved from point to point on the dial, measuring the flight of time. The sun-dial was in use among the earliest nations.

Herodotus is authority for the statement that the Greeks borrowed it from the Babylonians. The sun-dial was obviously of no use on cloudy days or dark nights, and even in sunny weather it could not accurately or delicately indicate the pa.s.sage of time. However, it continued in use so long that to the end of the seventeenth century the art of dialling was considered a necessary element of every course in mathematics.

Another ancient invention for measuring time was the water-clock. Water was permitted to drop from a small orifice in a containing vessel. The period required for emptying the vessel marked a unit of time. Its principle was the same as the common hour-gla.s.s, according to which time is measured by the slow dropping of sand from one receptacle into another. The water-clock was used by the ancient Chaldeans and the Hindoos, and also by the Greeks and Romans. Demosthenes mentions its use in the courts of justice at Athens.

In order to mark the hours of the day, the Saxon King Alfred the Great is said to have made wax candles twelve inches in length, each marked at equal distances. The burning of six of these candles in succession consumed, roughly, just twenty-four hours. To prevent the wind from extinguis.h.i.+ng them they were inclosed in cases of thin, white, transparent horn. The candles thus inclosed were the ancestors of the modern lantern.

Our word _clock_ comes from the Anglo-Saxon verb _clocean_ meaning "to strike," "to give out a sound." It is impossible to ascertain by whom clocks were invented, or when or where. It is fairly clear, however, that a Benedictine Monk named Gerbert, who afterward became Pope Sylvester II, made a clock for the German city of Magdeburg a little before the year 1000 A.D. Clocks may have been made before this, but if so it would be hard to establish the fact. In Gerbert's clock weights were the motive power for the mechanism. Weight clocks were used in the monasteries of Europe in the eleventh century, but it is probable that these early clocks struck a bell at certain intervals as a call to prayer, and did not have dials for showing the time of day.

[Ill.u.s.tration: A "GRANDFATHER'S CLOCK," BELONGING TO WILLIAM PENN]

The first clocks were comparatively by large and were stationary.

Portable ones appeared about the beginning of the fourteenth century, though the inventor is not known, nor the exact time or place of invention. When portable clocks were invented, the motive power must have been changed from weights to main-springs, and this change in motive force marks an era in the development of the clock. The introduction of the pendulum as a regulating agent was, however, the greatest event in clock development. This invention has been credited to Huygens, a Dutch philosopher, who was certainly, if not the discoverer of the pendulum, the first to bring it into practical use, about 1657. Credit for inventing the pendulum is also claimed for Harris, a London clockmaker; for Hooke, the great English philosopher; for a son of Galileo, the celebrated Italian scientist; and for others.

The modern watch is in reality but a developed type of the clock.

Watches were made possible by the introduction of the coiled spring as motive power, instead of the weight. The coiled spring came into use near the end of the fifteenth century, though it is not known where or by whom it was invented. Watches were not introduced into general use in England until the reign of Elizabeth, and then on account of the cost they were confined to the wealthy. At first watches were comparatively large and struck the hours like clocks. After the striking mechanism was abandoned, they were reduced in size and for a time were considered ornamental rather than useful. They were richly adorned with pictures in enamel and with costly jewels. They were set in the heads of canes, in bracelets, and in finger-rings.

Watches and clocks had originally only one hand, which indicated the hour. Minute and second hands were added later. Devices have been introduced to counteract the effect of temperature on the mechanism of time-pieces, so that they run uniformly in all kinds of weather. Within recent years clocks operated with electricity have been invented. With the advent of clock and watch manufacture by machinery, the cost has been so reduced that practically any one may own an accurate time-piece. The United States is one of the foremost countries of the world in the manufacture and sale of clocks and watches.

CHAPTER XVI

SOME MACHINES