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.
Detroit Edison's District-Heating Plant
Here is an article from The American Society of Mechanical Engineers about Detroit Edison’s District Heating System, established in 1903.
Thanks to John Shea of Detroit Steam Heat for sharing this wonderful history with us.
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