The New York legislature in 1888 passed a law providing that criminals should be executed in that state thereafter by electrocution, that is, by sending through the body of the condemned person, a current of electricity strong enough to produce death. Execution in this way makes death quicker and apparently less painful than by hanging, the method used previously, and subsequently several other states have passed laws for electrical execution, following the example of New York.
Elisha Gray, who contested with Bell the invention of the telephone, was the inventor of a peculiar machine called the telautograph. Tele and graph have been previously explained. Auto is from a Greek word meaning "itself." The meaning of telautograph, therefore, is "to write afar by itself." By means of the telautograph, which is operated with electric currents, if a person writes with an ordinary lead pencil on paper, say in Washington or any other place, at the same time the writing will be reproduced with pen and paper at the other end of the line, in New York or wherever the message may be sent.
One of the important uses of electricity is in connection with the electric block signal. This is a device for preventing railroad collisions. The signals are operated with electricity, and show engineers whether or not a certain section of the track ahead of them is clear.
Electricity is used also in the production of certain chemical substances; in covering base metals with a coating of a precious metal, as gold or silver, called electroplating; in producing a solid metal page from rows of type, called an electrotype, which is used in printing; in the navigation of small boats and the propulsion of automobiles; in playing organs and pianos; in driving electric fans; in drawing elevators in high buildings; in call-bells and door-bells; in police-alarms and fire-alarms; in the treatment of certain diseases; and in many other useful ways. What electricity may do for the future cannot even be guessed.
CHAPTER VI
THE DISCOVERY OF AMERICA
The birthplace of mankind is supposed to have been somewhere in Asia, untold thousands of years ago. The race is thought to have spread thence to the northern coast of Africa and to the peninsulas that jut down from the south of Europe. The travelers of ancient times were the Phœnicians. They occupied a narrow strip of land along the eastern shore of the Mediterranean Sea. Their country was small and with difficulty supported an increasing population. To the east of them were barbaric hordes, who poured over the mountains and pushed the Phœnicians to the sea, making of them traders and colonizers. As early as twelve centuries before Christ they were founding colonies, exploring strange lands, trading all over the known world, and leaving their alphabet wherever they went. Arriving at a favorable place, they would pull their ships ashore, plant a crop, wait till it had matured, reap it, and go on. They founded many colonies on such sites.
Herodotus, a Greek, born in Asia Minor nearly five hundred years before Christ, is called the father of history and geography. He tells us that in his time the earth was thought to consist of the coast regions of the Mediterranean Sea, extending rather vaguely north and south, and bounded on the west by the Atlantic Ocean and on the east by the great Persian Empire. The word Mediterranean is made up of two Latin words meaning "the middle of the earth." Eratosthenes, a Greek geographer who was born on the northern coast of Africa about three centuries before Christ, wrote a geographical treatise in which he announced his belief that the earth was in the form of a sphere revolving on its own axis. He succeeded in convincing only a few, however, that his theory was right. The next great geographer was Strabo, born in the northeast part of Asia Minor in the year 64 B.C. He was a great traveler and observer, and wrote a work on geography that has come down to us. The parts dealing with his own observations are especially valuable.
The great traveler of mediæval times was Marco Polo, an Italian, born in Venice in 1254 A.D. He traveled widely, had many adventures, and published an account of his travels. His experiences were a great stimulus to geographical inquiry and discovery. About this time also the mariners' compass was introduced into Europe. Civilization seems to be indebted to the Chinese for the compass, for it is mentioned by them as an instrument of navigation as early as the third or fourth century after Christ. With the advent of the compass, seamen were no longer compelled to hug the shore; they acquired more daring to sail the open sea, and geographical exploration was correspondingly widened.