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.
McKeown Intensifier
The Intensifier, invented by W.C. McKeown, does a job similar to the one performed by Honeywell's Heat Generator. Thanks to Steve Pajek for finding this patent.
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