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 Simplified Design and Installations
The Copper & Brass Research Association published this generic and easy-to-follow brochure in 1949. It contains some wonderful photographs of early installations, including one from Levittown.
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