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.
Low Temperature Heating and Cooling Systems for Low Energy Houses, Proved in Practice
A paper by Prof. Dr. B. Keller, Chair of Building Physics, Institute of Building Technolgy, ETH-Z (Swiss Federal Institute of Technology), Zurich, Switzerland. Thanks to Geoff McDonell, P.Eng., LEED AP for sharing.
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