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.
The Honeywell System of Hot Water Heating
This is a gorgeous little book that Honeywell prepared for homeowners and builders about their heating systems during the 1920s. Special thanks to Alex Marx for the terrific scan.
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