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.
Radiant Heating in a Small Residence
Here is a case study by A. M. Byers Company of Pittsburgh, circa 1945. It describes the radiant heating system in the Notz Residence, a small home in Mifflin Township, PA. Interestingly, the architect was Mrs. Cornelia Berndtson, under the supervision of Frank Lloyd Wright.
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