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Franklin invented the lightning rod based on what he learned from experiments with his electrostatic machine. [11] [40] Franklin and his associates observed that pointed objects were more effective than blunt objects at "drawing off" and "throwing off" sparks from static electricity. [12] [41] This discovery was first reported by Hopkinson. [19]
In 1752, Franklin proposed an experiment with conductive rods to attract lightning to a leyden jar, an early form of capacitor.Such an experiment was carried out in May 1752 at Marly-la-Ville, in northern France, by Thomas-François Dalibard. [3]
Franklin speculated about lightning rods for several years before his reported kite experiment. [citation needed] Drawing of a general store by Marguerite Martyn in the St. Louis Post-Dispatch of October 21, 1906, with a traveling salesman selling lightning rods. In the 19th century, the lightning rod became a decorative motif.
Thomas-François Dalibard (French pronunciation: [tɔma fʁɑ̃swa dalibaʁ]; born in Crannes-en-Champagne, France in 1709, died in 1778) was a French physicist who performed the first lightning rod experiment. [1] He was married to the novelist and playwright Françoise-Thérèse Aumerle de Saint-Phalier. [2]
The system of operation of the Franklin clock considers that the electrostatic force generated by an electric field is used to move the pendulums that strike two metal bells. [9] [10] The Franklin bells uses a metal rod as a lightning rod to attract current. One bell is connected to the lightning rod and the other bell is connected to the ground.
His numerous important inventions include the lightning rod, bifocals, glass harmonica and the Franklin stove. [8] He founded many civic organizations , including the Library Company , Philadelphia 's first fire department , [ 9 ] and the University of Pennsylvania . [ 10 ]
Directly to Franklin's right is another group of cherubs tinkering with a tool. Franklin's right arm, the Cherub to his right, and the Cherub to his left, come together to form a triangle, the compositional foundation of the entire painting. The arrangement directs the viewers' eyes to Franklin's hand and the lightning key.
Experiments and Observations on Electricity is a treatise by Benjamin Franklin based on letters that he wrote to Peter Collinson, who communicated Franklin's ideas to the Royal Society. [ 1 ] [ 2 ] The letters were published as a book in England in 1751, and over the following years the book was reissued in four more editions containing ...
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