
Genuine WWII US Army voltmeter IS-185, model 433 dated 1944. The voltmeter is a magnetically, A.C. iron-vane type equipment incorporating a frequency-compensated movement. It permits accurate voltage measurments on alternating voltages of nonsinusoidal wave forms.
Also used in the US Army Air Force to test heating equipments.
Genuine WWII US Army voltmeter IS-185, model 433 dated 1944. The voltmeter is a magnetically, A.C. iron-vane type equipment incorporating a frequency-compensated movement. It permits accurate voltage measurments on alternating voltages of nonsinusoidal wave forms.
Also used in the US Army Air Force to test heating equipments.