Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Capitol Boilers and Radiators Catalog (1934)
Here is a Capitol Boilers and Radiators catalog from the United States Radiator Corporation, printed in 1934. It features the Capitol Red Top Boilers (A Series, B Series, and C Series), Capitol Black Top Boilers, Capitol Oil Burning Boilers, Capitol Round Boilers, Capitol Radiators, Capitol Fincast Radiators, and Capitol Enclosures.
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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
This chapter on hot water heating systems and piping was prepared by Professor F.E. Giesecke (Director of Texas Engineering Experiment Station in TX) for the The American...
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