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.
Byers Wrought Iron for Radiant Heating
A.M. Byers Company sold wrought iron pipe, not systems, but they put this booklet together to promote radiant heating. It's really well done, with lots of installation photos.
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