Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Elements of Industrial Heating (1922)
Elements of Industrial Heating was published in 1922. "The purpose of this booklet is to draw attention to essential factors governing the quality and cost of products subjected to the action of heat in the process of manufacture, and the selection and use of equipment, fuel or electricity necessary to produce better results at lower cost." To access this book online, click here.
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Perfex Series 155 Magic Dial Thermostat
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