Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Thanks, @parallelmotion.  Can I use the picture in my article?

The only evidence I currently have as to who made these three engines is circumstantial.  Can you judge an engine by the company it keeps?

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The Hero engine, which is also in the Smithsonian, is likely the engine in the front, just to the right in this picture.



The designer/manufacture of Maxwell's engine also produced a fire engine.  It has the same flywheel and boiler shown in the horizontal above.  I haven't found a picture of that engine yet.