This will be my second offering for my table. I got my start in model engineering building steam engines, some from the old Popular Mechanics magazines and some from Stuart kits. Each class of engine has its own uniqueness, the compound or expansion marine type, the variations in the Corliss designs and the beams with their parallel links. I have built a beam but haven't built a true Corliss. I did want to build an expansion engine of the triple type so I started with the drawings for the Stuart compound marine engine. I took the displacement difference between the high pressure and low pressure cylinders then used that factor to size the low pressure cylinder for the triple. Oh and I scaled all the dimensions down to 1/2 of the original Stuart. The cylinders and chests are made of iron. The crank is a two piece affair to get the center bearing and eccentrics installed. I used pictures of other triples to create the base and links.
https://youtu.be/KWF7jRd-3eU