Signedon base: MORRIS E. LEEDS CO. / PHILADELPHIA / 1999
Marked on base: MORRIS LEEDS & CO. / PHILADELPHIA / 1999
Inscribedon side of base: 386
FunctionUsed to create and break an electrical circuit.
According to instrument card, this bridge key was once used (c.1921-1927) in a Physics 3 setup of a meter calibration of L. & N. Type K bridge.
ProvenanceFrom Harvard University physics department