Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Warming Buildings By Hot Water (1917)
Warming Buildings By Hot Water is "a practical treatise upon warming industrial and residential buildings, places of worship and horticultural glasshouses, heating drying-rooms, also warming by direct-indirect and indirect methods embracing all low-pressure gravity and accelerated systems and the high-pressure systems." To access this book online, click here.
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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...
Jarecki Radiators (1890)
Here are ratings for the Erie radiator from Jarecki Mfg Co Ltd. They were based in Erie, PA and their radiators appeared in issues of Domestic Engineering in the 1890s.