Signedon cylindrical case: Cambridge / Instrument CO. LTD. ENGLAND / C121520
on base: CAMBRIDGE / INSTRUMENT CO INC / OSSINING, N.Y. / No ______
FunctionQuadrant electrometers are used for absolute measurements of electrostatic potentials. For more information and other types of such electrometer, go to the following website.
ProvenanceFrom the Deparment of Physics, Prof. Duane's laboratory, Harvard University.