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.
Bishop & Babcock Vacuum Vapor System of Steam Circulation
This document from the Bishop & Babcock Manufacturing Company showcases their vacuum vapor system of steam circulation. Thanks to Patrick Linhardt for scanning and sharing this with us.
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