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.
Radiant Heating in a $15,000 Office Building
This is a case study from the A. M. Byers Company of Pittsburgh, circa 1945. It's about the radiant heating system in the Greenville Steel and Foundry Company Inc. building in Greenville, SC.
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