【實用書籍app】The Battery and the Boiler|最夯免費app-gigacircle

Talking of that, it was not until the last century that master minds found out how to catch and handle our Spark. In all the previous centuries he had been roaming gaily about the world in perfect freedom; sometimes gliding silently to and fro like an angel of light; sometimes leaping forth with frightful energy in the midst of raging tempest, like a destructive demon—ripping, rending, shattering all that attempted to arrest his course. Men have feared and shunned him since the beginning of time, and with good reason, for he has killed many of the human race.

But although uncaught and untamed by them, our Spark was not altogether unknown to the ancients. So far back as the year 600 before the Christian era, Thales, one of the Greek sages, discovered that he hid himself in amber, a substance which in Greek is named electron—hence his name Electricity; but the ancients knew little about his character, though Thales found that he could draw him from his hiding-place by rubbing him with silk and some other substances. When thus rubbed he became attractive, and drew light creatures towards him—not unlike human sparks! He also showed himself to be fickle, for, after holding these light creatures tight for a brief space, he let them go and repelled them.