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Image: Gold leaf electroscope 1869

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Description: Drawing of a gold-leaf electroscope from around 1880s. This is an early electric charge detecting instrument. When an electrically charged object is touched to the brass top terminal, the charge is conducted to the delicate gold leaves. Since they have the same polarity charge they repel each other, and spread apart in a "V" shape.
Title: Gold leaf electroscope 1869
Credit: Downloaded from James Edward Henry Gordon (1889) A Physical Treatise on Electricity and Magnetism, 2nd Ed., Vol.1, D. Appleton & Co., New York, p.32, fig.9 on Google Books
Author: James Edward Henry Gordon
Permission: Public domain - published in USA before 1923
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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