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.
Broomell Heating System Patents
Here are patents from the early 1900s for the Broomell heating system. Thanks to Gerry Gill for finding and sharing these patents. It's a wonderful walk through heating history.
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