This quarter scale DeLamater Rider hot air pumping engine from about 1872 was displayed by David Nunes at Alexandra Palace. Castings used to be available from Jerry Howell in the US, but Engineers Emporium in the UK has added it to their catalogue.

The prototype engines were made by the DeLamater Iron Works of New York City during the late 1800s and early 1900s. They were used for pumping water in country estate homes, on ranches, railroads, greenhouses and other applications and were sold all over the world. They came in 4", 5", 6", 8" and 10" cylinder diameters.  The pumped water circulates around the cooler cylinder and some also cools the top of the heater cylinder.