Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
The Ventilation of Dwelling Houses (1881)
This book on ventilation and heat was written by Frederick Edwards, Jr. and published in 1881. It contains information about the ventilation of dwelling houses and the utilization of waste heat from open fire-places, including chapters on London smoke and fog, modern fire-places, etc. To access this book online, click here.
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Perfex Series 155 Magic Dial Thermostat
The American Society of Heating and Ventilating Engineers Guide (1929) - Hot Water Heating Systems and Piping
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