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.
Vapor Heating: The Richardson System
The Richardson System of vapor heating was popular in the 1910s and 1920s. It's very simple, and you must run it at very low pressure (less than 1 psig) on a vaporstat. This document in from The Heating and Ventilating Magazine.
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