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.
Audel's Plumbers and Steam Fitters Guide - Steam Heating
Frank D. Graham wrote books called Audel's Plumbers and Steam Fitters Guide that were so easy to understand. This chapter is about steam heating.
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The American Society of Heating and Ventilating Engineers Guide (1929) - Hot Water Heating Systems and Piping
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