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 Heating Specialties for Vapor and Vacuum Systems
Trane made some of the finest vapor heating equipment in the world. This catalog explains how their heating system works, and it shows the insides of all the equipment.
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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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