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.
How to Install the Dunham Vapor Heating System
Here are comprehensive instructions from 1916 from the C.A. Dunham Company about How to Install The Dunham Vapor Heating System. Thanks to David Cordes for sharing.
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