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This video shows a 1908 Leiman rotary air pump, serial #433.
The pump is built like shown in the 1904 patent & it has a lot of machine work to the inside, see last pics of video. I bought the pump & converted it to an air engine as a kid; no modifications were done to the pump, all that was added was some plumbing & a flywheel. I put together a pressurized oil lubricator (made out of an old junk brass steam lubricator) to feed oil into the pressurized inlet airline. The Leiman pump is well made & even has oil well reservoirs & rings to oil its main bearings. It’s shown running on about 100 psi max air line pressure. Wide-open is has all kinds of torque.
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