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.
Supplementary Instructional Manual to Instruction Manual for Steamfitter-Pipefitter Journeymen and Apprentices - Supplement No. 6 - Hydronic Panel Heating
The material in this pamphlet was prepared by the National Joint Steamfitter-Pipefitter Apprenticeship Committee in 1955. There are a lot of very good photos of radiant heating systems in here.
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