This is a model of an early marine engine of the side lever type. The prototype would have been in a paddle steamer, with the paddles mounted directly on the crankshaft. In this model, a large flywheel is used instead. The engine frame is a decorative Gothic style.
The single cylinder is double acting with a piston valve. It is 40mm stroke x approx 25mm bore. It is mounted vertically on the base plate. The piston rod has a horizontal bar fixed on it's end. The two ends of the bar have connecting rods which connect to the ends of a pair of beams, pivoted centrally, very low down near the base plate. The other ends of the two beams have connecting rods which connect to the crank shaft. The two cranks are in phase. The crank shaft is mounted in bearings at the top of the frame.Between the cranks there is a heavy 150mm diameter spoked flywheel, and also an eccentric for the valve linkage. This connects via a bell crank to the valve rod at the top of the steam chest, operating a piston valve. There is no reversing capability.
The whole engine is made mainly of brass castings with only the crank shaft and a few small parts made of steel. The engine frame is in two halves bolted onto the brass base plate. This plate is mounted on a wooden plinth. The brass parts have a simulated patina applied and there is no paint. The wood plinth is varnished and carries a brass nameplate with the name EIWI. (This is an earlier name of the PSE company.)
The model is used but "as new". I have not yet tested it on steam at the time of writing but it runs on air. Running is not as smooth as I expected and I suspect the valve timing. I will have to investigate later.