The is the second of a two part series of silent movies about how cars worked in the 1920s. This episode explains how the engine works and uses hammer and canons to explain how the pistons move.

We've stabilized and remastered this video, added a soundtrack and generally made it more watchable. The original video is in the public domain and we retrieved it from the internet archive.

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And check out our guide to how modern cars work at www.howacarworks.com