Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Electric Heating (1916)
Electric Heating was written by E.A. Wilcox and published in 1916. It "aims to set forth in a practical way the many uses to which electric heat may be applied." And "suggestions are given regarding approved methods of installing and using domestic and commercial ranges, bake ovens, water heaters and industrial heating devices." To access this book online, click here.
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Perfex Series 155 Magic Dial Thermostat
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