Henleys Electrometer
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“The electrometer of Henley, sometimes called Henley’s quadrant Henley electrometer, may be taken as the type of single pendulum electroscopes. It consists essentially of a pendulum A hinged to meter a verticle support C, which carries a vertical graduated semicircle B, by means of which the deviation of A from the vertical can be indicating the state of electrification of the prime conductors of electric machines. The stem is screwed into the conductor, and the divergence of the pendulum indicated roughly the charge.” — Encyclopedia Britannica, 1893
Source
The Encyclopedia Britannica, New Warner Edition (New York, NY: The Werner Company, 1893)
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