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A slinky can be any Length It's made from a long pipe cut in a continuous ribbon, in the same way piston rings are made for Automobiles. In the 1960's we lived in Muskegon Michigan not far from a company called "Ring Power" that made piston rings, the employs would bring home scraps for there kids that were the same thing.
The slinky was invented In 1943. during World War II, an engineer in the United States Navy was on a new ship's run. As he worked, a torsion spring suddenly fell to the floor. the spring flip-flopped as the ingenious man watched. The naval engineer's name was Richard James, and when he returned home, he remembered the spring and the interesting way it flip-flopped. James and his wife Betty perfected a long steel ribbon tightly coiled into a spiral.
They began production in 1945. Richard and Betty borrowed $500.00. They started a company. They called it James Spring & Wire Company. Richard made a machine. He designed it himself. When it was finished, it made Slinkys. They were made of 80 ft of wire. The wire came from Sweden. In 1956 the company changed its name. It became James Industries.
From that spring's accidental fall came a toy Americans have enjoyed for over fifty years, the Slinky. The non-electrical, no-battery-required, non-video toy has fascinated three generations of children and adults alike. According to one estimate more than 300 million Slinkys have been sold and the only change in the original design has been to crimp the ends as a safety measure.
Statistics taken from Encyclopedia.
A stretched out Slinky is 87 feet long.
► H.K. - Tulsa, OK
twice half its length
id say about 6"
it will circle the earth 3x