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.
Polyethylene, A Modern Plastic, From Its Discovery Until Today
On November 28, 1990, I heard Professor Thomas Engel, the inventor of PEX plastic, speak in Sweden. The occasion was the Wirsbo-PEX 10 Times Around the World celebration. This is the speech Professor Engel delivered that day. It's a wonderful story. - Dan Holohan
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