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 Report on Performance of a One-Pipe Steam System in the I=B=R Research Home
Published in June 1949, this work was was done at the University of Illinois Urbana, where the Institute of Boiler and Radiation Manufacturers once did all of their research.
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