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.
American Standard G-2 Gas Boiler Manual
This is the American Standard G-2 Gas Boiler Installation-Operation and Maintenance Manual (Supplement for Steam Non-Packaged Boilers with Flush or Deluxe Jackets).
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The American Society of Heating and Ventilating Engineers Guide (1929) - Hot Water Heating Systems and Piping
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