pneumatic veljko oscillator
You could try it with a bicycle pump, even a foot pump, and glue (really well) a second valve to an inner tube. The hard part would be getting a piston to push the pendulum - how does it switch on to fill the piston with air and how does the piston open in order to let the pendulum fall back - Maybe look up steam engine pistons, maybe buy one of those hobby / toy steam engines and sacrifice it's piston? Or one would need precision machining tools. And then it begs the question, what useful work can it do once - hopefully - it is running itself? But, interesting thoughts.
You could try it with a bicycle pump, even a foot pump, and glue (really well) a second valve to an inner tube. The hard part would be getting a piston to push the pendulum - how does it switch on to fill the piston with air and how does the piston open in order to let the pendulum fall back - Maybe look up steam engine pistons, maybe buy one of those hobby / toy steam engines and sacrifice it's piston? Or one would need precision machining tools. And then it begs the question, what useful work can it do once - hopefully - it is running itself? But, interesting thoughts.
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