La Hire’s Hypocycloidal Train Mechanism

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La Hire's hypocycloidal train mechanism
La Hire's hypocycloidal train mechanism.

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Description

Philippe de La Hire (1640 – 1718) was a French scientist and engineer who, among other things, worked on the theory of epicycloids.

In this device, a small wheel is driven inside a circular rack twice its diameter, by means of a brocken axis b,c,d. It found a common use in various sort of pumps, as it allowed water or any other fluid to draw through a continuous circular movement.

The caption reads in the original French: Épicycle rectiligne de Lahire.

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