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 Elements of Heating and Ventilation (1913)
The Elements of Heating and Ventilation by Arthur M. Greene was published in 1913 as a text-book for students, engineers, and architects. To access this book online, click 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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