ANSWERS: 3
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Have you not ever noticed how the slinky appears to be an over sized... spring? therefore i can easily see how it could be an industrial application. :)
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I've always failed to see how you make it move down the stairs personally.
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It wasn't intended to be used in a machine, but was a by-product of a search for an anti-vibration device : The Slinkyโข was invented by Philadelphia engineer Richard T. James in the mid-1940s. The Slinkyโข is a toy made of a steel or plastic coil that tumbles smoothly down a flight of stairs. It wasn't James's intention to create a toy. The Slinkyโข was actually the result of a failed attempt to produce an antivibration device for ship instrumentsโsomething that would absorb the shock of waves. When James accidentally knocked one of his steel spirals off a shelf, he saw it literally crawl, coil by coil, to a lower shelf, onto a stack of books, down to the tabletop, and finally come to rest, upright, on the floor. James' wife, Betty, saw its potential as a toy and named it "slinky." Betty James, now age 78, still runs James Industries, the company she founded with her husband in 1946 to market the toy Slinkyโข. from http://science.enotes.com/science-fact-finder/general-science-technology/who-invented-slinky Kind of like Post-It โข notes was a by-product of an attempt to invent a new glue.
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