Report on cold-rolled iron and steel . stress, and reported upon in thepreceding pages. There were thirty-five samples in all, viz: First, 15 of common or hot-rolled iron, comprising five sizes,nominally:* A=2T95 inches in diameter; B=2T^ ; C^=lf;D=1TV; E=|f. Secondly, 15 samples of cold-rolled iron, alsoof five sizes; A=2T7g- inches in diameter; Br=2; C^ly^-;D=l; Er=f. Thirdly, 5 samples of cold-rolled and annealediron, one of each of the cold-rolled sizes. The lengths of the test-pieces were 40 inches or more. In thisreport the sizes will always be designated by the letters A to E,as above.
Report on cold-rolled iron and steel . stress, and reported upon in thepreceding pages. There were thirty-five samples in all, viz: First, 15 of common or hot-rolled iron, comprising five sizes,nominally:* A=2T95 inches in diameter; B=2T^ ; C^=lf;D=1TV; E=|f. Secondly, 15 samples of cold-rolled iron, alsoof five sizes; A=2T7g- inches in diameter; Br=2; C^ly^-;D=l; Er=f. Thirdly, 5 samples of cold-rolled and annealediron, one of each of the cold-rolled sizes. The lengths of the test-pieces were 40 inches or more. In thisreport the sizes will always be designated by the letters A to E,as above. *The diameters of the untreated iron, as obtained by actual measurement,and as given upon the record sheets, and upon which the calculations are based,do not exactly agree with the above. The nominal diameters of the cold-rolledbars, however, accord with the measurements made upon them. 58 DESCRIPTION OF THE TRANSVERSE TESTING MACHINE. The machine employed in testing by transverse stress is readilyunderstood from the accompanying It consists of a Fairbanks Scale, on the platform of which restsa heavy cast iron beam, C, to which are fastened the supports, D,D, at the required distances apart. The pressure is applied bymeans of the hand wheel on the upper end of the screw, K, whichscrew passes through the nut, E, and terminates in the slidingcross-head, I. This cross-head serves both as a guide and as apressure block. The test-piece, L, rests upon mandrels mountedupon the supports, D, D, at the required distance apart. The loadsare weighed in the usual manner at M. The instrument for measuring deflections is not shown in the 59 cut; it consists of an accurately cut micrometer-screw of steel,having a pitch of of an inch, working in a nut of the samematerial, mounted in a brass frame. This instrument is supportedby a rod of considerable rigidity and of sufficient length, which issecured to the beam, C, close to the tension-rods, F, F, in such amanner that the micrometer
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Keywords: ., bookcentury1800, bookdecade1870, bookidreportonc, booksubjectiron
