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.
Campanelli System
Here are the complete installation instructions for the radiantly heated homes in the Weathersfield development of Schaumburg, Illinois, built by the Campanelli Brothers. Their hydronic homes included a York-Heat boiler system.
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