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.
Design of Radiator/Convector Configurations in One- and Two-Pipe Water Installations
A big thanks to Mike Thies for scanning this rare article from Danfoss. There's a heavy emphasis on one-pipe water systems in this one. Great stuff.
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