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.
Atmospheric Pressure or So Called "Vapor" Systems
This document about Atmospheric Pressure and Vapor Systems is from Audel's Plumber's and Steamfitter's Guide No. 3, which appeared in 1925.
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