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Trevithick's Overcrank Engine of 1812

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Jasonb:
While looking through some old MEs to see if I could find an engine for another ME member I came across a 4-part series by ET Westbury on building an engine by Trevithick that was used for threshing. stating in Vol 132 No 3301.

It is not a model that I have heard mention of it or seen any images of completed examples. The same applies for my Google searches for any reference material. So I’m wondering if any members can shed some light on the origins of the design, Westbury shows an engraving of what looks to be the boiler with the top of the cylinder poking out but no mention of where the image was found.

It could be an interesting one to build, I have a few ideas that vary from Westbury’s deviations but would really like an engraving or similar of a complete engine to go by. Google does throw up a threashing engine but that seems to be a horizontal boiler and most of the Science Museum images don’t show up.

CI:
Nice single-acting steam engine with rotary valve.

The old engraving seems to show an access hole, which for a boiler was generally an oval shaped cover that goes into the boiler and is caught and sealed on a flange around the opening.

The ME design seems to show a safety valve where the access hole is.

I think you would want a water gauge, safety valve, water input, and blowdown valve at the bottom.
Perhaps a valve for a whistle.

You would want to crown the top and the bottom to prevent cracking of the plates.

I have never seen this design.
There seems to be an infinite variety in steam engine designs.

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CI:
Looks a lot like this one, except this one has a horizontal boiler.

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CI:
Found this one.
Also an horizontal boiler, but simliar.

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CI:
Here is one that looks the same.
Link to website.

https://www.advrider.com/f/threads/richard-trevithick-steam-trailblazer-extraordinaire.759395/

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