Signedon plaque: WESTON STANDARD CELL / MODEL 4 No. 5114 / PATENTED / APRIL 4, 1893 AUG. 16, 1899 / WESTON ELECTRICAL INSTRUMENT CORP. / NEWARK, N.J., U.S.A.
FunctionStandard cells produce a known and stable voltage for the calibration of electrical measurement instruments. It contains a chemical cell inside the black case.
A very similar standard cell can be found at Kenyon College, listed on this website.
ProvenanceFrom the Department of Physics, Harvard University.