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.
Building With Assurance
In 1923, the Morgan Woodwork Organization had Crane prepare the Development of Home Heating portion of their Building with Assurance book. A bit of history, and some easy-to-follow sizing information here. Enjoy!
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