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.
Hoffman Engineering News (on Panel Heating)
Hoffman Specialty's Director of Engineering, Ferdinand Jehle, wrote these four interesting "Engineering News" letters in 1946.
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The American Society of Heating and Ventilating Engineers Guide (1929) - Hot Water Heating Systems and Piping
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