"The prototype engines were made by the DeLamater Iron Works of New York City during the late 1800's and early 1900's. 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. This engine was built from my own "lost wax investment" castings. The flywheel is 3.330" diameter. Bore and stroke is .615"x .750". The double acting "Rolling Valve" water pump has a .156" bore and .750" stroke and will pump quite a stream of water. The pumped water circulates around the cooler cylinder and some also cools the top of the heater cylinder. The engine is fired by a propane burner with a flame 1/2" diameter and less than 3/16" high. The engine runs cool, with the warmest part being the furnace which is never too hot to touch. The regenerator passage is fitted with very fine stainless steel screen wire folded accordian style, but it is not known for certain how much effect it actually has. In late 1999 I made this engine available as a serial numbered "1 of 50" castings and material kits. These sold out in just a few months and are NO LONGER available.*"  - JEH