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.
Choosing a Heating Plant Wisely
The Plumbing and Heating Industries Bureau published this booklet in 1944, in anticipation of the end of World War II. The advice they gave then still applies today.
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