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.
I=B=R Installation Guide Number 6 - Panel Heating for Small Structures
This 1951 Guide from the Institute of Boiler and Radiation Manufacturers made radiant heating systems pretty easy to understand and install during the early years.
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