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 Heat with Copper Tubing - A Practical Research Program
This document contains a series of interesting articles by Mills and LaTart of Revere Copper and Brass about radiant heat with copper tubing. It is not dated, but is most likely from the late-1940s. Thanks to Jim Walls for finding and scanning this one.
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