Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Handbook for Heating and Ventilating Engineers (1920)
Handbook for Heating and Ventilating Engineers was written by James D. Hoffman and published in 1920. This is the Fourth Edition. It states, "Changes in the art of heating and ventilating buildings have been so pronounced in the last few years that it has been considered advisable to entirely reconstruct the Handbook rather than to make additions to the old text." To access this book online, click here.
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Perfex Series 155 Magic Dial Thermostat
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