Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
NIRA Window Seat Radiator (1916)
This excerpt about the NIRA Window Seat Radiator for Steam and Hot Water Heating is from Facts for Fitters, a 1916 catalog from The Hunting Co.
Thank you to Frank "Steamhead" Wilsey of All Steamed Up for sharing this document with us.
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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.