. The Varsity war supplement 1916. of itfor warship armour. This determined me to have a test made of thethree principal kinds of armour-plate then known, in order that I mightknow what would be the latest and most effective for our use. Therenever had been an armour-plate test made in the United States. Wehad imported armour for years and had always taken for grantedwhat the foreign makers had said regarding the result of tests. I had the trial of the plate made at Annapolis, in September,1890. There was the English, or compound armour-plate of was the all-steel armour of Le C
. The Varsity war supplement 1916. of itfor warship armour. This determined me to have a test made of thethree principal kinds of armour-plate then known, in order that I mightknow what would be the latest and most effective for our use. Therenever had been an armour-plate test made in the United States. Wehad imported armour for years and had always taken for grantedwhat the foreign makers had said regarding the result of tests. I had the trial of the plate made at Annapolis, in September,1890. There was the English, or compound armour-plate of was the all-steel armour of Le Creusot. There was the plate ofnickel steel. First we used 6-inch guns. The compound armour was was a little doubt as to the exact differences in results with theother two kinds. So we used 8-inch guns in order that the plates, or the worstplate of the lot, should be tested to destruction. The result of that test changed the naval history of the shots perforated and shattered the English compound plate. The. Interior of Blast Furna all-steel plate was broken into four separate pieces, holding togetheronly by the serrated edges of the ruptured material. But the nickelsteel remained absolutely uncracked, the apertures made in it beingplugged by the projectiles. The integrity of the plate as the coveringof a ships side was practically as perfect at the close of the trial as ifno shot had been fired. Following this test it was recognized that the Harvey process: for hardening the surface of tool steel undoubtedly would have a, peculiar value when used in combination with the newly-developedqualities of nickel steel. So armour made of high carbon nickel| Harvey plate was made, and on the proving ground of the BethlehemIron Company, July 30th, 1892, five Holtzer forged-steel shells,i , weighing 250 pounds each, with a striking velocity of 1,700 feet asecond, and each with an energy of 5,000 tons to the square foot,f 1 were fired at the plate at a distance of th
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