Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Gorton Heating Equipment Catalogue No. 92
This booklet contains Gorton & Lidgerwood Co.'s complete heating system product offering in 1926. It has sections on the Gorton Single Pipe Vapor Heating System, the Gorton Quarter Turn Packing Lock Radiator Supply Valves for All Systems of Heating, information on the effects of radiator enclosures, and more. Check out the air vent on page 23, which they designed to frustrate thieving school children.
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