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.
Modern Furnace Heating for Dwellings, Churches, Stores, Etc.
This wonderful booklet is from The Hess Warming and Ventilating Co. of Chicago, IL. Along with it, you'll find a sales letter from George Hess to L.H. Burns, dated March 20, 1909, and an estimate sheet. Mr. Hess did a fine job.
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