Gas-fired DeLamater Ericsson in action
Just finished a "reconditioning" of this engine. I won't call it restoration since I only needed to add the air chambers, rebuild the pump and get a new piston leather. It is nearly as nice as when it left DeLamater Iron Works in New York City in the late 1880s-early 1890s: no wear in any of the bearings and runs as quiet as a mouse, or at least as a rat. The first DeLamaters from the early 1880s had a simple cylindrical pump, shorter water jacket, lighter flywheel, and thinner, weaker linkages. The improved version got a new pump designed by Thomas Rider (son of Rider engine inventor A.K. Rider), beefier linkages and a heavier flywheel. Thomas Rider, in charge of all hot air engine production at DeLamater at the time, also patented an inner sleeve used inside the hot cylinder to increase efficiency.
Here's the video: