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 Brochure from the Copper & Brass Research Association
The Copper & Brass Research Association published this brochure in 1949. It tells the radiant heating story very well, and the installation photos are well worth a look.
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