Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Electric Heating (1895)
Electric Heating was written by Edwin Houston and A.E. Kennelly and published in 1895. It is part of a series entitled The Elementary Electro-Technical Series to provide the general public with reliable information about electricity, especially those who are not trained in "electro-technics." To access this book online, click here.
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