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.
Gravity Heating System Design
Thanks to Mike Thies for finding and sharing this chapter. He writes, "This is from the book, Heating Design and Practice, 1951, by Robert Henderson Emerick. While not really about piping practice, it's the best I've found at explaining the science behind gravity systems."
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