One of the most admirable characteristics of any teacher is the ability to explain very complex concepts through very simple illustration. I can think of few better examples than this 1937 film that shows the layman how differential gearing works. If you’re not familiar with the term, differential gearing is the complex mechanism that allows both drive wheels of your car to turn at differing speeds, such as during a turn, or for one to turn while the other is stuck or immobilized. Very well-done Chevy.
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