Science Art: Chain Saw, US 1655856 A, Jan. 10, 1928.

Chain Saw patent illustrationClick to embiggen

A patent for a device putting wood-cutting blades on a chain, so that people can cut down trees – or, in the wake of hurricanes, cut up ones that have fallen down.

Technically, this patent was merely an improvement on existing chainsaws, with better joints between the tooth-carrying links on the chain.

There’s a metaphor there.

The patent also calls it an “endless chain.”

There’s a metaphor there, too.

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