Signedon nameplate: THE EPPLEY LABORATORY, INC. / NEWPORT, R. I. / CAT. NO. 100 MADE IN U.S.A.
Inscribedon nameplate: STANDARD CELL / LOW TEMPERATURE COEFFICIENT FORM OF / THE INTERNATIONAL STANDARD OF E. M. F. / NO. 129787 / INTERNAL RESISTANCE NOT OVER 500 OHMS
FunctionThe standard cell is used as a reference voltage when measuring electrical bridges with a potentiometer. According to the markings of a panel, the standard voltage of this cell is 1.01837 volts.
ProvenanceFrom the Department of Physics, Lyman Laboratory, Harvard University.