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"One of the best-known instruments of this [electrometer] class is Coulomb's torsion-balance, which consists essentially of gilt ball, i, carried at the end of a horizontal shellac needle that is suspended by a fine silver wire from the top of a tube that rises from the cover of the enclosing glass cylinder. A vertical insulating rod passing through the cover carries a handle, a, and a gilt ball, e, at its ends." -Avery 1895

Coulomb's Torsion-Balance

"One of the best-known instruments of this [electrometer] class is Coulomb's torsion-balance, which…