Signedembossed on black plaque: 1 AMP. SHUNT / 50 MV. DROP / USE WITH / MODEL __ No __ / MADE BY / WESTON ELECTRICAL INSTRUMENT CORP. / NEWARK, N.J., U.S.A. / PATENTED MAY 16, 93 DEC. 8.08
Functionfor Meter Model 35 and 56 or SWITCHBOARD 50 M.V.
According to card, the shut is pivoted with bolts rather than wing bolts for current conductors, which would indicate it was used with a switchboard meter.
ProvenanceFrom the Jefferson Physical Laboratory, Harvard University. Was used for teaching Physics 3 class; and from Pierce Hall, Engineering School, Harvard University.