Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
The Problem Solver Hydronic Heating Handbook (August 1984)
This August 1984 issue of The Problem Solver Hydronic Heating Handbook by Wallace Eannace Associates, Inc. is about heating system noises. It covers velocity noise, noisy pump bearings, pipe expansion noises, misalignment, reverse pump rotation, trapped air in a pump body, cavitation, not enough pressure at the top floor, chattering flow valves, as well as chattering pressure-reducing valves.
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Perfex Series 155 Magic Dial Thermostat
The American Society of Heating and Ventilating Engineers Guide (1929) - Hot Water Heating Systems and Piping
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