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.
Furnaces - Get the Right Heating System
Here is a very informative brochure about furnaces, written by Jonathan Beers, who is the Residential Services Manager Madison Gas and Electric Company. We thank him for sharing it with us.
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The American Society of Heating and Ventilating Engineers Guide (1929) - Hot Water Heating Systems and Piping
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