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.
Hot-Water Heating - Prepared Especially for Home Study
The International Correspondence Schools of Scranton, PA published this home-study course in 1907. It's a nice explanation of gravity hot water heating.
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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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