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.
Vapor Heating: The Mouat Vapor System
The Mouat Vapor System was one of the classics of vapor heating! Here is an excerpt from The Heating and Ventilating Magazine explaining how this system works. And you'll find the Mouat Vapor Heating Co. circa-1926 catalog here.
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The American Society of Heating and Ventilating Engineers Guide (1929) - Hot Water Heating Systems and Piping
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