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 Ideal System
This is an excerpt from The Heating and Ventilating Magazine, published around 1910. It covers The Ideal System of Vapor Heating from the Ideal Heating Equipment Company of Cleveland, Ohio.
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