Signedprinted on glass: STANLEY MFG. CO / PITTSFIELD MASS. / U.S.A.;
Inscribed
printed below instrument scale: VOLTMETER / FOR / ALTERNATING OR DIRECT CURRENT / NO. 1799 PAT'D APRIL 1895
FunctionVoltmenter for alternating or direct current.
ProvenanceFrom the Physics Department, Harvard University. Lyman Laboratory. 3/16/61.