D.—2.

Enclosure 3 in 1 of No. 19. Report on Tensile Tests of Forty-four Wrought-Iron Bars, rolled from Halves of Axles, Twenty-two 1½ -in. square, and Twenty-two ½-in. square. Received from Messrs. the Patent Nut and Bolt Company. Received, October 15th; Tested, October 16th, 24th and 26th. Engineering Laboratory, University College, London, W.C., 25th October, 1884.

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Dimensions. TJ.C.L. Marks Test on Breadth Tbickness. Area. Dimensions. Limit of Elasticity. Pounds. Tons. Founds. Breaking Load. Tons. Ratio of tenv?n° n Reduction on wbole f . . lengths of pitctare Winches. * "cture. Extension on 3 inches at Fracture. Remarks. to Break. INCH-AND-A-HALF BARS Sq. in. Per sq. in. Per sq. in. Per sq. in. Per sq. in. Per cent. Per cent. 7,585 7,580 7,588 S.X. s.x. s.z. L055 inches diameter 1 '058 inches diameter 1-058 inches diameter •874 •879 •879 36.66C 35,540 33,840 16-37 15-87 15-11 57,080 55,220 54.650 25-48 24-65 24-40 •626 ■664 •619 22-9 140 21-6 34-3 23-4 40-2 36-0 19-0 330 Silky, some lamination, about 40 per cent, crystalline. Irregular, 75 per cent, crystalline, welding a little defective. 25 per cent crystalline, and granular in patches, the rest chiefly silky. 45 per cent, crystalline, and granular in patches, tte rest chiefly silky. About 40 per cent, crystalline in patches, the rest silky, somewhat spongy in structure. Irregular, 70 per cent, crystalline, some rcediness. 7,589 s.z. P05S inches diameter •879 35,540 15-87 54,310 24-25 ■654 24-0 On 8 in. ) 223 \ 33.9 33-3 7,591 s.c. 1-046 inches diameter •859 31,770 14-18 53,290 23-79 •596 358 31-3 7,592 s.c. 1-043 inches diameter •854 32,890 14-68 54,420 24-30 •604 21-1 On 8 in. ) 23-1 j On 8 in. 238 j 13 5 On 8 in. | 26-4 \ 25-7 26-0 23-2 34-4 30-0 7,594 S.D.G. 1-050 inches diameter •866 34,120 15-23 50,000 25-00 •609 30-9 29-0 36 per cent crystalline. 7,595 7,597 S.D.G. S.E. 1-042 inches diameter 1-057 inches diameter •853 •877 33,300 33,680 14-87 15.04 55.580 54,530 24 81 24-34 •599 •618 31.-9 219 31-3 19-3 40 per cent, crystalline, welding a little defective. 90 per cent, somewhat coarsely crystalline, cinder flaw in centre and on surface. 55 per cent, crystalline, a little cinder. About 50 per cent, crystalline, the rest silky. About 50 per cent, crystalline, the rest silky. 25 per cent, crystalline in patches, the rest silky. 7.598 7.600 7,601 7,603 S.E. M.L. ML. M.G. 1 -044 inches diameter 1-052 inches diameter 1-050 inches diameter 1-050 inches diameter ■856 •869 •866 •866 36,510 36,880 35,450 34,640 16-30 16-46 15-83 15-47 57,480 57,870 57,450 53,690 25-66 25-83 25-65 23-97 •635 •637 •617 •645 36-9 42-6 42-4 40-9 *130 tl8-3 15-2 17-3 39-4 40-2 39 0 41-7 39-5 38-4 36-7 39-3 36-7 36-0 7,604 7,606 7,607 7,609 7.610 7,612 7.613 7,615 7.616 M.G. M.H. M.H. L.I. L.I. L.J. L.J. L.K. L.K. 1-057 inches diameter 1-045 inches diameter 1-050 inches diameter 1 -056 inches diameter 1-054 inches diameter 1-056 inches diameter 1-040 inches diameter 1-058 inches diameter 1-045 inches diameter •877 •858 ■866 •876 •873 •876 •850 •879 8-58 33,510 37.900 33,720 29,590 30,940 29,980 32,200 31,160 26,240 14-96 16-92 15 05 13-21 1381 13-38 14-38 13-91 11-71 54,480 60,590 60.210 51,850 51,700 51.040 52,110 53,340 53,470 24-32 27-05 26-88 2315 23-08 2279 23-26 23-81 23-88 •615 •626 ■560 •571 •598 ■587 •618 •584 •491 18-1 15-0 17-0 25-0 25-8 24-0 27-7 22-3 23-9 16-7 17-0 18-7 35-7 38-7 36-0 37-0 35-7 37-3 96 per cent, crystalline. Crystalline throughout. Crystalline throughout. Silky, a slight cinder flaw in centre. Silky, a slight cinder flaw in centre. Silky, a slight cinder flaw in centre. Silky. About 5 per cent finely crystalline, the rest silky. Silky, specks of crystal. * At fracture. t At smallest section.