Volume 11 , Issue 39

1880 - Technology

A bush roller chain patented by Swiss engineer Hans Renold improved on the the James Slater drive chain of 1864. Renold had acquired Slater's small textile machine chain factory at Salford and had devised a chain with an arrangement of bushes that prodded a much greater load-bearing surface than did the Slater chain.

Warner-Swasey Company was founded at Chicago by former Pratt & Whitney toolmakers Worcester Reed Warner, 34, and Ambrose Swasey, 34. The epicycloidal milling machine invented by Swasey in 1879 was a gear-cutting device that produced true theoretical curves and thus made possible the production of silent gears.
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