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The Lakeland Evening Telegram
Lakeland, Polk County, Florida
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The Millgate Monthly describes wiring a 12-inch, 13.5-ton gun with 117 miles of piano-wire-quality steel tape under high tension, varying layers by section, followed by heat-shrunk rings and automatic rifling tested with guttapercha.
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According to the Millgate Monthly no fewer than 117 miles of steel wire are wound on a twelve inch gun that weighs thirteen and a half tons. In appearance this wire, which is of the same quality as piano wire, resembles tape. It is a quarter of an inch wide and a tenth of an inch thick. It is tested to a breaking strength of 110 tons. The wire unwinds from a reel as the gun barrel evolves, and a tension of about fifty tons to the square inch insures mechanical accuracy in wrapping it round the gun.
Various parts of the gun receive different thicknesses of wire. At the breech of a twelve inch gun, where the chief strain comes, there are ninety-two layers, which give a thickness of nine and a half inches of wire, but at the muzzle there are only fourteen layers. Over the wire the gunmakers shrink steel rings at white heat. When they cool they contract and grip with immense force. The rifling of the barrel is an automatic process, an example of wonderful mechanical ingenuity.
When the gun is finished experts test the accuracy of the rifling with plastic guttapercha.
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According to the Millgate Monthly, no fewer than 117 miles of steel wire are wound on a twelve-inch gun that weighs thirteen and a half tons. The wire, resembling tape and of piano wire quality, is a quarter of an inch wide and a tenth of an inch thick, tested to a breaking strength of 110 tons. It unwinds from a reel as the gun barrel evolves, with a tension of about fifty tons to the square inch ensuring accuracy. Different parts receive varying thicknesses: ninety-two layers at the breech (nine and a half inches thick) and fourteen at the muzzle. Steel rings are shrunk over the wire at white heat, contracting upon cooling to grip tightly. Rifling is an automatic process, and accuracy is tested with plastic guttapercha.