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.
Edgar Wiley Vapor System Patents
Here are patents for the components to E.C. Wiley's vapor heating system from 1916. Thanks to Steve Pajek and Gerry Gill for sharing these patents with us.
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