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.
Marsh System of Vapor Heating
This document outlines the Marsh System of Vapor Heating from JAS. P. Marsh Corporation of Chicago. It also contains information about the Marsh Boiler Return Trap and the Marsh No. 11 Air Trap. Thanks to Denise Kersting for getting this literature and sharing it with us.
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