Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Cyclopedia of Engineering (1910)
Published in 1910, the Cyclopedia of Engineering is a general reference work on steam boilers, pumps, engines, and turbines, gas and oil engines, automobiles, marine and locomotive work, heating and ventilating, compressed air, refrigeration, dynamos motors, electric wiring, electric lighting, elevators, etc. To access this book online, click here.
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Perfex Series 155 Magic Dial Thermostat
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