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.
Unusual Hot Water Heating Method (1922)
Before circulators arrived, heating contractors tried some very interesting things to get the water to flow where they wanted it to flow. Here's a good example of that from Western Plumber in 1922.
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