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.
Trane Steam Heating System Patent (1901)
This document contains the Trane Steam Heating System Patent circa 1901. This system used mercury to produce vacuum.
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The American Society of Heating and Ventilating Engineers Guide (1929) - Hot Water Heating Systems and Piping
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Jarecki Radiators (1890)
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