Signedon instrument display: GALVANOMETER / TYPE 189A SERIAL NO. 17 / RES. 10 OHMS. FULL SCALE 121 MICRO AMPS / GENERAL RADIO CO. / CAMBRIDGE, MASS.;
Inscribedprinted on two metal adjustment knobs on instrument case: ZERO SET; LOCK & FREE;
FunctionGalvanometer, measures the electrical current in a circuit. For direct current.
Historical AttributesGreen triangle indicates it was used ibut green triangle indicates it was used in the student's labs at the Cruft Laboratory (Harvard) 1925.
ProvenancePhysics Department, Harvard University. Found in Jefferson Laboratory, 1956.