sold in this country, By means of these devices files may be sprung so as to give are said to be made by machinery. The difficulty attending the introduction of machinery in Imore or less convexity to their working faces. pillar; 5, square; 6, warding; 7, round; 8, cabinet; 9, pit- lUIUbnnittliiU… … In economizing the wear of files intended for general cutting the larger files in general use was not practically purposes, consideration should be given to the kind of ma- surmounted until within the past fifteen or twenty years. terial to which they are applied in the different stages of Now,…
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