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.
Rayduct: The Pipe for Radiant Heating
This 1948 booklet from Bethlehem Steel about their Rayduct pipe for radiant heating is filled with photos of radiant heating jobs. It contains some very to-the-point information about radiant-heating design and installation.
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