Perfex Series 155 Magic Dial Thermostat
Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Nash Engineering Company Steam Heating Controls
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 condensate pumping equipment. Thank you to Dennis Pataki for sharing this document.
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