An interesting, and very rare, little engine made by Gem Products of Wiltshire, in the early post World War 2 period. They also produced steamboats and their stationary engine has a distinctly marine look about it. Their logo was a red triangle, the ghost image of which is visible on each side of the brass boiler shroud. Apparently, their engines were sold in war surplus cardboard Gas Mask boxes.
The construction of the cylinder is rather unusual; it appears to be a brass tube mounted in a zinc alloy die-casting. The base plate is drilled with holes at the standard Meccano spacing of half an inch. The only other thing I know about this delightful little item is that it was made around 1950. Any further information would be most gratefully received.
Sadly, the original burner has long gone but apart from that the engine is in extremely fine and original condition. After a very gentle clean the engine was fired up and I was delighted to find that It runs very well indeed, with no significant vibration. The crankshaft is fitted with a substantial balance weight and this must be a contributing factor the smooth running.