. The railroad and engineering journal . urately joining the plates together. To escape these difficulties, and still secure proper thick-ness of metal, further experiments were had, first withplate-upon-plate armor—that is, placing the solid plates injuxtaposition—and afterward with what is known as sand-wich armor, or armor where the plates are separated bylayers of wood. In the Russian experiments of 1869 an il-in. Krupp steelprojectile of about 500 lbs. in weight was driven through15 in. of wrought-iron in two plates, three i-in. inteimedi-ate plates, and 36 in. of wood backing. Up to this
. The railroad and engineering journal . urately joining the plates together. To escape these difficulties, and still secure proper thick-ness of metal, further experiments were had, first withplate-upon-plate armor—that is, placing the solid plates injuxtaposition—and afterward with what is known as sand-wich armor, or armor where the plates are separated bylayers of wood. In the Russian experiments of 1869 an il-in. Krupp steelprojectile of about 500 lbs. in weight was driven through15 in. of wrought-iron in two plates, three i-in. inteimedi-ate plates, and 36 in. of wood backing. Up to this time Vol. LXIII. No. 12.] ENGINEERING JOURNAL. 571 this was by far the best showing for the gun. Three yearslater the failure of the 12-in. 25-ton English rifle to perfo-rate or disable the 12-14-in. turret of the Gtatlon showedthe advantages of metal when disposed in a circularstructure over that exposed on a flat surface. During 1876-77 a series of were conductedin England against sandwich armor. A rifle was. FIQ>. I able to perforate three solid plates separated by5-in. layers of teak. The same gun, when fired with anincreased charge against the same target, strengthened bythe addition of a fourth plate and another 5-in. layerof teak, failed to get its projectile through the last test the relative powers of resistance of solid and sandwich armor, a solid 16,5-in. vvrought-iron plate, consideredequal in strength to the three plate target above re-ferred to, was attacked by the same gun. A sand-weightedPalliser shell was driven through it without difficulty. During further experiments with sandwich armor, a tar-get of four S-in. plates of wrought-iron, with 5-in. layersof teak between the plates, was attacked with the gun and a 1,700-lb. projectile. The projectile failedto get through, was stopped after penetrating a little over26 in. of the 32 in. of iron, and the intermediate 15 in. ofteak. At a seco
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
