Clockwork radio
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A clockwork radio is a device that uses the energy of a spring to generate electricity to power the radio. The spring receives its energy by someone winding it up from handle.
Clockwork Radio Media
Hobby-horse fair-LCCN2006681691
British penal treadwheel
A mechanically powered flashlight. This uses a linear generator and is charged by shaking along its long axis.
BC-778 "Gibson Girl" radio transmitter.
U.S. soldiers during WWII powering radio set using GN-45 hand crank generator
The original Baygen clockwork radio with crank in winding position
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