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A look at a iconic bit of equipment, the classic "Honeywell Round" thermostat.
NOTE: there were a couple of small things I had corrected in annotations to the video, however KZfaq removed the annotations feature so those have been lost. I don't remember exactly what they are now, so know that I may have gotten some minor details wrong.
Thanks to David Barts for pointing out one of the corrections: the rheostat IS the heating element.