Pedal-Powered Radio Transmitter
The Pedal Radio (or Pedal Wireless) was a radio transmitter-receiver powered by a pedal-driven generator. It was developed by Alfred Traeger in 1929 as a way of providing radio communications to remote homesteads in the Australian outback.[6] There were no mains or generator power available at the time and batteries to provide the power required would have been too expensive. It is considered an important Australian invention.[7]
https://infogalactic.com/info/Human_power#Pedal-powered_transmitter
I'd like to see a low power computer running on one of these, with like some kind of "natural" battery like compressed air or something in case you stop pedaling for a bit...
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