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.
How To Care For Your Heating Plant
Here is a booklet from the American Radiator Company that will give you a good sense of how hands-on the proposition of owning a heating system used to be. Special thanks to Alex Marx for the wonderful scan.
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