The Action of Lightning And the Means of Defending Life And Property From Its Ef
The Action of Lightning And the Means of Defending Life And Property From Its Ef
Arthur Parnell
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3. ) 48 LIGHTNING. II. A 7 13. (7. ) In 1729, Stephen Gray also observed the electric spark, and that the power evolved seemed to be of the same nature with that of thunder and lightning. In the same year he first noticed the actions of conduction and insulation. (Do. 13 and 14. ) (8. ) In 1733 37, the influence of moisture as a conduc- tor was first demonstrated by Du -Fay, who sent a charge through 1, 256 feet of pack-thread. He also discovered that there are two kinds of electricity, vitreou...s and resinous. (Do. 22. ) (9. ) On the 23rd January, 1744, Ludolf, at the opening of the Academy of Sciences at Berlin by Frederick the Great, first ignited substances by the electric spark. (Do. 80. ) (10. ) On the 4th November, 1745, Kleist, a clergyman of Cammin, in Pomerania, announced by letter to Dr. Lieberkiihn, of Berlin, the discovery of the principle of the Leyden jar. Kleist missed the explanation of the prin- ciple, but the Leyden philosophers gave it, whence it derived the name of " Leyden jar.
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