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.
Table of Estimated Radiation
Written by Harry B. Perrigo in 1913, these four pages of simplified sizing information for heating systems must have been in the pockets of many a Dead Man over the years. Thanks to Gus Stants for sharing it with us.
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