1915 Crossley Brothers gas engine - GIF

1915 Crossley Brothers gas engine.

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Previously:

https://www.homemadetools.net/forum/...119#post153618
https://www.homemadetools.net/forum/...082#post125698
https://www.homemadetools.net/forum/...028#post120267

What is driving it? the jack shaft on the right or the crank?

There's a power switch on the wall to the left, I'd guess a motor buried under or in it.