Stories of Invention Told By Inventors And Their Friends
Stories of Invention Told By Inventors And Their Friends
Edward Everett Hale
The book Stories of Invention Told By Inventors And Their Friends was written by author Edward Everett Hale Here you can read free online of Stories of Invention Told By Inventors And Their Friends book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Stories of Invention Told By Inventors And Their Friends a good or bad book?
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He acknowledges Mr.XoUinson's present of the glass tube as early as March 28, 1747. On the nth of July he writes to Collinson that they (" we ") had discovered the power of points to withdraw electricity silently and continuously. On this discovery the lightning-rod is based. He describes this quality, first observed by Mr. Hopkinson, in the following letter : — "The first is the wonderful effect of pointed bodies, both in drawing ojf and throwing off iht electrical fire. " For example, place a...n iron shot, of three or four inches diameter, on the mouth of a clean, dry glass bottle. By a fine silken thread firom the ceiling, right over the mouth of the bottle, suspend a small cork ball about the bigness of a marble ; the thread of such a length, as that the cork ball may rest against the side of the shot. Elec- trify the shot, and the ball will be repelled to the distance of four or five inches, more or less, according to the SHARP CONDUCTORS, 10$ quantity of electricity. When in this state, if you present to the shot the point of a long, slender, sharp bodkin, at six or eight inches distance, the repellency is instantly destroyed, and the cork flies to the shot A blunt body must be brought within an inch and draw a spark, to pro- duce the same effect.
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