Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Heating and Ventilation (1908)
Heating and Ventilation was written by Charles L. Hubbard and published in 1908. It was presented as a working manual of approved practice in the heating and ventilating of dwelling-houses and other buildings, with complete practical instruction in the mechanical details, operation, and care of modern heating and ventilating plants. To access this book online, click here.
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Perfex Series 155 Magic Dial Thermostat
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