Tachometer, Victometer Centrifugal, 1920s USSR dated Oct 29

dated Oct 29

The glass is intact

The knob was used to set the flow rate

Here is an engine Torque Pressure Indicator

depressing the lower right knob

Tachometer, Victometer Centrifugal, 1920s USSR dated Oct 29This 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