Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
I=B=R Installation Guide (Number 2): One-Pipe Steam Heating Systems
This book from The Institute of Boiler and Radiator Manufacturers called I=B=R Installation Guide (Number 2): One Pipe Steam Heating Systems was published in March, 1946. It provides the basis for installing one-pipe steam heating systems for buildings having a heat loss no greater than 92,640 Btu/hr.
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Perfex Series 155 Magic Dial Thermostat
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