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.
Progress in Heating and Ventilating During the Past Quarter of a Century
This is a reprint of an article that first appeared in the A.S.H.V.E. Journal section of Heating, Piping and Air Conditioning magazine in January 1931.
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