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.
Johnson Vapor Heating Systems Book
This book is from the Johnson Vapor Heating Company in Boston, MA. It is not dated, but is most likely from the very early 20th Century. Thanks to Brian Reynolds for sharing.
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