Signedetched and white filled on top panel, center bottom: SIGNAL CORPS U.S. ARMY / DIRECT READING WAVEMETER / TYPE S.C.R. 60 ORDER 40733SC / SERIAL No 190 / GENERAL RADIO COMPANY / CAMBRIDGE, MASS.
on face of meter: HOT WIRE / GALVANOMETER / MODEL 127 NO. 894 / GENERAL RADIO CO. / CAMBRIDGE, MASS.
InscribedFront piece: illegible
FunctionWavemeters can be used to check the wavelength of a strong signal source. It can also check the output of a transmitter for harmonics.
The output of this instrument is an electric current, which is read using a galvanometer, which is included.
This wavemeter was likely used in accordance with radio and military operations