Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Burning Liquid Fuel (1922)
Burning Liquid Fuel was written by William N. Best in 1922 and was subtitled "a practical treatise on the perfect combustion of oils and tars, giving analyses, calorific values and heating temperatures of various gravities, with information on the design and proper installation of equipment for all classes of service." To access this book online, click here.
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