Signedon dial: WESTINGHOUSE ELECTRIC & MFG. CO., PITTSBURGH, PA, U.S.A
Inscribedsticker on front base: 562
FunctionMoving coil ammeter to measure direct currents. Uses an internal permanent magnet and a metal coil which moves in a magnetic field in reaction to the electrical current, which is translated to the scale on the dial.
ProvenanceFrom the Department of Physics, Lyman Laboratory, Harvard University.