Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
European Heating Systems in 1907
Thanks to Frank "Steamhead" Wilsey for finding and sharing these pages from Heating By Steam and Water: A Practical Treatise on House Heating, published in 1907. He tells us, "This is the earliest orifice system, patented sometime prior to 1901 by Frederic Tudor. Also known as the French or German system since it was popular there. We've seen four of these in Baltimore." And thanks to Gerry Gill for providing us with Mr. Tudor's patents.
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