Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Milwaukee Valve Company Bulletin (1935)
Here is some very good literature on the Milwaukee Valve Company's vapor heating product offering from 1935, including the MILVACO Air Line Valve, the Type "M" Boiler Return Trap, the Type "V" Thermostatic Trap, MILVACO Quick Vents, MILVACO Automatic Air Valves, and the MILVACO Air Eliminator or Float Vent. Thanks to Patrick Linhardt for scanning and sharing.
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Perfex Series 155 Magic Dial Thermostat
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