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.
Explosion Reports from the Early-1930s
Boiler explosion reports from Hartford Steam Boiler Inspection and Insurance Company's Locomotive magazine. Special thanks to Frank "Steamhead" Wilsey for finding and scanning this eye-opening literature.
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