Disc Electrometer

“C is an insulated disc, over which is suspended another disc, hung from the arm of a balance, and connected with the earth. A weight w is put in a scale attached to the other arm of the balance. The insulated disc is connected with the internal armature B of a Leyden jar, whose outer armature is in connection with the suspended disc, Electricity is conveyed to B, and the quantity q measured by a small Lane’s jar A, until the electric attraction at C is just sfficient to turn the balance.” — Encyclopedia Britannica, 1893

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