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

Hi, Tony,

Maybe it's my lack of brain power these days, but I see only one piston there, with a dual connecting rod thing attached to the crosshead. Those two rods run off identically timed crankshaft throws, and I guess are necessitated by the design of the frame. Neat.

But am I wrong? Is there another piston and valve assembly lurking somewhere beyond the range of my failing vision?