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.
A Look Ahead
Hugh J. Barron of the Barron Steam Heating Company, a New-York-based engineering firm, made this speech to the Master Steam and Hot-Water Fitters Association of the United States on June 6, 1893. It's filled with history and his "look ahead" was remarkably perceptive.
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