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.
The Hoffman - A Venting Valve for Every Service
The Hoffman - A Venting Valve for Every Service shares the Hoffman story, as told 30 years after George D. Hoffman introduced his first vent. Wonderfully clear language here!
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The American Society of Heating and Ventilating Engineers Guide (1929) - Hot Water Heating Systems and Piping
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Jarecki Radiators (1890)
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