Originally a "megger" like this would have been used for performing electrical leakage safety tests on appliances & installations as well as accurately measuring electrical resistance. The item to be tested would be connected to the black laquered terminals on one side, appropriate rotary knobs would be set, the handle is then turned quite fast & the leakage or resistance is read off the meter scale. Turning the handle makes a satisfying whirring sound. A numeric code can be set on the 4 dials on the front panel.
The machine actually produces about 500 Volts but at a safely limited current of about 2mA. This can be painful if you're not expecting it or if it's applied to sensitive parts of the body. Apprentices would often use these to shock their unsuspecting colleagues. The megger could therefore be used for electric shock torture scenes.
At a pinch you may get away with using it as one of those wind-up remote detonators for explosives.
Prop ID: 2738
Width: 23 cm
Height: 17 cm
Depth: 20 cm