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.
The Proper Operation of the Home Heating Plant
The Proper Operation of the Home Heating Plant: Simple Rules for Saving Fuel is "a book of information for all forms of heating systems" from our friends at the Minneapolis Heat Regulator Company. There is no copyright date on this book, but it is most likely from the 1920s.
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