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.
The Heating Plant by H.W. Means
Thanks to John Van Hoesen for finding and sharing this interesting article about how to fire a steam boiler in an elementary school, circa 1916. It urges the fireman to keep a log of the time, the outdoor temperature, and the pressure on the boiler. Wonderfully simple!
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