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.
Ratings for Radiators with Corrugated, Ringed, and Plain Surfaces
This is an excerpt from Rolla Carpenter's "Heating & Ventilating Buildings" with a table about Experiments on Different Steam-Heated Surfaces and Different Materials (Wrought-Iron, Cast-Iron, Steel, and Brass Pipes. Corrugated, Ringed, and Plain Surfaces). This includes ratings for radiators from the 1800s including the Clogston, Walworth, Union, Triumph, Peirce Excelsior, Gold's Pin Indirect Radiator, Howard Oxbow Radiator, among others.
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