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In page Slingshot:

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Slingshots depend on strong elastic materials for their projectile firepower, typically vulcanized natural rubber or the equivalent such as silicone rubber tubing, and thus date no earlier than the invention of vulcanized rubber by Charles Goodyear in 1839 (patented in 1844). By 1860, this "new engine" had established a reputation for use by juveniles in vandalism. For much of their early history, slingshots were a "do-it-yourself" item, typically made from a forked branch to form the Y-shaped handle, with rubber strips sliced from items such as inner tubes or other sources of good vulcanized rubber, and using suitably sized stones.[citation needed]