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 Principles of Heating (1912)
The Principles of Heating was written by William G. Snow and published in 1912. It is "a practical and comprehensive treatise on applied theory in heating." To access this book online, click here.
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