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 Should the House Be Heated?: Heating by Hot Water
Here's an article, Heating by Hot Water, which appeared in The House Beautiful magazine around 1915.
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The American Society of Heating and Ventilating Engineers Guide (1929) - Hot Water Heating Systems and Piping
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