Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Dominion Radiator Company's Safford (1901)
This circa-1901 booklet from The Dominion Radiator Company out of Toronto, Canada is a joy to read and is beautifully illustrated. It's early-20th-Century marketing at its best. It showcases Safford Radiators, which were "installed in many public buildings of importance in the British Empire and Continental Europe."
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Perfex Series 155 Magic Dial Thermostat
The American Society of Heating and Ventilating Engineers Guide (1929) - Hot Water Heating Systems and Piping
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