Murray's Hypocloidal steam engine, the oldest working steam engine with a hypocloidal gear.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...e_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...eam_engine.jpg
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More: https://en.wikipedia.org/wiki/Murray...cloidal_Engine
Previously:
https://www.homemadetools.net/forum/...335#post116470
https://www.homemadetools.net/forum/...271#post142021
https://www.homemadetools.net/forum/...2579#post96643
https://www.homemadetools.net/forum/...723#post128920
https://www.homemadetools.net/forum/...692#post102204
https://www.homemadetools.net/forum/...0622#post72832