Heating Museum → Controls Help Topics

These pages are from Nash Engineering Company's Bulletin #402-D describing their variable vacuum sub-atmospheric steam heating controls using their own vacuum and condens...

Here is an advertisement for H. G. Ashton's Insulated Lock Safety Valve from 1872.

A patent for H.G. Ashton's Improvement in Lock Safety Valves for Steam Boilers. (Courtesy of Rick Ashton, great great grandson of Henry G.

Here are the installation and operation instructions for Weil-McLain CGM 7 Ignition Essex Gas Controls (circa 1981)

Here is a United States Patent assigned to the Thermiser Manufacturing Corporation for a flue box assembly, dated January 30, 1979. "In summary, the present invention pro...

Here are the installation instructions for Minneapolis-Honeywell diaphragm gas valves, dated October 1, 1945. Thanks to Mike Zydiak for sharing this with us.

Here is a United States Patent for McDonnell & Miller's #11 Switch, dated October 28, 1941. Thanks to Gerry Gill for finding and sharing this one. 

Thanks to Gerry Gill for finding and sharing this patent. And thanks to Tim McElwain for these comments about the patent, "It looks like the prototype for what became Hon...

Thanks to Terry Tekushan for finding and sharing this one with us. He writes, "I thought this would be a nice addition to the museum. It goes well with Gerry Gill's submi...

Thanks to Gerry Gill for finding and sharing this patent. He adds, "We got nothin' on the old-timers!"