Description1911 Britannica - Siemens Electrodynamometer.png English: Siemens electrodynamometer. F, Fixed coil D, Movable coil S, Spiral spring T, Torsion...
Shalov 963×672× (42839 bytes) {{Information |Description= Siemens electrodynamometer, circa 1911. F = Fixed coil, D = Movable coil, S = Spiral spring, T...