Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Notes on Heating and Ventilation (1905)
Notes on Heating and Ventilation was written by John R. Allen and published in 1905. "The chapters comprising this book are a brief resume of the lectures delivered by the author to the classes in heating and ventilation at the University of Michigan. The subject matter was first published as a series of articles in Domestic Engineering." To access this book online, click here.
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Perfex Series 155 Magic Dial Thermostat
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