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.
Audel's Plumbers and Steam Fitters Guide #3
This document is from the 1949 edition of Audel's Plumbers and Steam Fitters Guide #3 and includes an informative section on radiant heating. Thanks to Larry Weingarten for finding and sharing this.
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