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.
Ideal Heating Journal Magazine (November 1912)
This edition of the Ideal Heating Journal Magazine from November 1912 contains a wonderful ode to a radiator, and a fascinating article about the first safety valve.
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