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 for The Modern Home
This circa-1947 brochure from Kohler makes a great case for hydronic heat. The "radiant" they refer to in the title isn't floor-heating, but cast-iron wall radiators.
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