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.
Trane Vacuum System: A Perfected Heating System
This booklet features one of Trane's earliest systems for producing vacuum in a steam system, through the use of a pot filled with mercury and specialized air valves.
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