Scientific American Supplement, No. 483, April 4, 1885
ScientificAmericanSupplement,No.483,April4,1885
Various
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There will be an engine at each end of theroad, which, it is calculated, will wind up the springs in at least twominutes' time. While the mere construction of such a working motor involved nothing new, the real problem involved consisted of the rolling of a piece of steel300 feet long, 6 inches wide, and a quarter of an inch thick. Anotherelement was the coiling of this strip of steel preliminary to tempering. To temper it straight was to expose the grain to unnecessary strain whenwound in a cl...ose coil. To overcome this was the most difficult part ofthe work. At the exhibition the inventor gave an illustration of themethod which has been employed by the company. The strip of steel isslowly passed through a retort heated by the admixture of gas and air atthe point of ignition in proportions to produce intense heat. When thestrip has been brought to almost a white heat, it is passed between tworollers of the coiling machine. It is then subjected to a powerful blastof compressed air and sprays of water, so that six inches from themachine the steel is cold enough for the hand to be placed on it.
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