Classic How It Works Video: A Differential Gear

Enjoy a vintage gem of the How It Works genre

In honor of How It Works Month here at PopSci, please enjoy with us this elegantly done film explaining how a differential gear works. It dates from the 1930s, but BoingBoing reminded us how truly excellent it is.

The film was created by Chevrolet and stars the Victor McLaglen Motor Corps. The explaining starts around 1:50.

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