drilled plate, annealed or not 83,485 78,893 81,189 36.24 double-riveted joints, punched holes, annealed plate, 96,163 87,606 91,885 41.02 steel rivets 102,593 72,408 90,000 40 1 Kirkaldy. 97,150 67,686 81,960 36.6 دو mean of the two .. 99,870 70,047 85,977 38.4 53,245 23 77 H. Sharp. 48,272 36,557 42,380 18.92 Hawks and Crawshay. 48,765 33,376 56,089 45,002 48,160 21 5 Captain Brown. 83,000 78,430 78,430 14,270 6.37 80,214 35.8 E. Clark. Telford. :::: :::: 12,716 23,468 32,077 23,461 96,300 73,185 32 67 Anderson. 1,273 0.568 Muschenbroek. 16,000 7-142 Hodgkinson and Fair bairn. 27,916 12 46 Owen, &c. TABLE 1.-Of the TENSILE STRENGTH OF MATERIALS-continued. Breaking Weight per Square Inch. Material. copper 2, zinc 1 Gun-metal, copper 9, tin 1 Muntz-metal, copper 6, zinc 4 Copper, cast, pure Copper bolts, 24, 2, 1, and inch diameter Kind of Wood. Max. Min. Mean. TABLE 1—continued.—TENSILE STRENGTH OF TIMBER. Authority. Kind of Wood. Max. Min. Authority. Mean. 14,186 6-3 19,500 8.7 17,850 15,784 17,077 7.6 2. 12,000 5.4 Muschenbroek. Lignum-vita 17,709 7.9 Muschenbroek. 22,200 9.8 Bevan. Muschenbroek. lbs. lbs. lbs. tons. Holly Bevan. Lance-wood 6. Barlow. Bevan. Larch Bevan. Rondelet. 11,800 5.3 3. Barlow. Mahogany 8,900 4.0 10,220 4.6 8,224 7,950 8,041 3.6 3. Barlow. 15,500 6.9 20,000 9.0 Muschenbroek. 4,973 2.2 Muschenbroek. 12,100 5.4 Bevan. 10,500 4.7 13,300 6.0 Muschenbroek. 14,000 6.3 Bevan. 18,100 17,600 17,850 8.0 14,000 12,300 12,900 5.8 7,000 3.1 15,000 6.7 10,000 4.5 Muschenbroek. Norway Plane-tree Sycamore Teak Bevan. 12,008 8,889 10,389 4.6 6. Barlow. 19,800 15,000 17,400 7.8 2. Bevan. 17,300 7.7 Muschenbroek. 13,950 6.2 Rondolet. Bevan. Pear-tree 11,537 8,834 9,822 4.4 3. Barlow. Pine, St. Petersburg 13,300 5.9 Bevan. 7,818 3.5 Muschenbroek. 14,300 12,400 13,350 6.0 Bevan. .. 11,700 5.2 11,800 5.3 Muschenbroek. |