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 Heating and Ventilating of Buildings (1916)
The Heating and Ventilating of Buildings was published in 1916 by B.F. Sturtevant Company. It contains interesting old photos of factories and railway buildings. 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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