Helmholtz's quadrant electrometer

1876 in Berlin

Helmholtz's quadrant electrometer, brass with lining of ebonite and tin foil, made by T.R. Voss, Berlin, 1876. Helmholtz improved Kelvin's quadrant electrometer by using Leyden jars made of ebonite or vulcanite rather than glass, which held charge much longer (14 days rather than 1). Needle and mirror could also be easily removed, and needle could be raised or lowered without shaking the instrument. See note.


Electricity and Magnetism
Object Number:
Voss, R.

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