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.
Questions and Answers for the Home Fireman
This brochure was published in 1936 by the U.S. Department of Commerce, all in the interest of saving fuel and improving comfort when it comes to heating systems. Thanks to Alex Marx for doing the scan for us.
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