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.
Modern Plumbing and Heating from Sears, Roebuck and Co., Philadelphia
In their day, Sears had it all over today's home centers when it came to heating, as you'll see. This is from 1927. We've included only the section on heating.
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