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.
It's All In The Venting
Unfortunately we don't have a source for this article called "It's All in the Venting" by John Schulz, but it's probably one of the best articles we've ever read on air venting from steam systems. It helped Dan Holohan understand a lot when he was writing The Lost Art of Steam Heating.
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