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.
Johnson Vapor Heating Systems Bulletin
Johnson Vapor Heating Systems was of the more obscure systems from the Turn of the Century. This bulletin from Johnson Vapor Heating Co. outlines how the system works. Thanks to Alex Marx for sharing this rare document with us.
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