Tachometer, Victometer Centrifugal, 1920s USSR depressing the lower right knob

depressing the lower right knob

Here is an engine Torque Pressure Indicator

The glass is intact

Likely made by Horn

made by Bendix and labeled for engines #1 & #2 and 3 & #4

Tachometer, Victometer Centrifugal, 1920s USSR depressing the lower right knobThis is a WWI or Post WWI vintage aircraft or laboratory tachometer "Victometer" made by the Jos W Jones Co. This is a centrifugal tachometer: as the rotation of the engine shaft rotates a cable attached to the case, flyweights rotate around an internal axis. The weights move outwardly due to centrifugal force, which pull a brace attached to the spring loaded pointer. As the brace is pulled by the centrifugal force of the weights, the pointer is