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 Mercury Seal Ad (1901)
This document contain an ad from Domestic Engineering (circa 1901) featuring the Trane Mercury Seal which was attached to an old steam heating system or to an old vapor plant of any type. The mercury seal was used to create vacuum within the heating system.
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