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.
United States Radiator Corporation's Boilers and Radiators
This book from the United States Radiator Corporation contains information about their Capitol Boilers and Radiators. Thanks to Bob Moore for finding and sharing this document 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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