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At this early period he also seems to have directed his attention to screw-making a branch of mechanics in which he afterwards became famous; and he proceeded to make a pair of very satisfactory die-stocks, though it is said that he had not before seen or even heard of such a contrivance for making screws. So clever a workman was not likely to remain long a village slater.
While at Glasgow he had made an improved pair of die-stocks for screws; and, at Aberdeen, he made a turning-lathe with a sliding mandrill and guide-screws, for cutting screws, furnished also with the means for correcting guide-screws.
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