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.
Trends in Heating Development
K. C. Richmond, Editor of Coal-Heat magazine, questioned 38 industry leaders and published this booklet in July, 1942. He asked them to speculated about trends that would take place in the heating industry once the war was over. Their predictions make for some fascinating reading.
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