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.
Johns-Manville Improved Asbestocel Advertisement
Back in the day (1924), when asbestos was still a good thing, this ad appeared. It makes an excellent case for why pipes and boilers need to be insulated.
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