Tachometer, Victometer Centrifugal, 1920s USSR Likely made by Horn

Likely made by Horn

This is an excellent specimen of the Contact Altimeter (Kontakt-Hohenmesser) Fl

depressing the lower right knob

such as the B-17 Flying Fortress (see image illustrating the location of the co-pilot's regulator from the B-17F flight manual dated 1943)

We have not yet identified the type of RCAF aircraft which may have used this indicator

Tachometer, Victometer Centrifugal, 1920s USSR Likely made by HornThis 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