. The railroad and engineering journal . rown prismatic powder ;the striking velocity of the projectile 2,075 foot-seconds,and the striking energy 2,988 foot-tons. The targets werearranged in a semicircle, 28 ft. from the muzzle of the trial began on September 18, when four shots werefired at each of the plates from the 6-in. gun, beginning inthe lower right-hand and ending in the upper left-handcorner of the plates. Four days later a single shot from an8-in. rifie was fired at the centerof each plate. In the second 7 in. respectively ; the second and third s(uck after pene-trating 15.
. The railroad and engineering journal . rown prismatic powder ;the striking velocity of the projectile 2,075 foot-seconds,and the striking energy 2,988 foot-tons. The targets werearranged in a semicircle, 28 ft. from the muzzle of the trial began on September 18, when four shots werefired at each of the plates from the 6-in. gun, beginning inthe lower right-hand and ending in the upper left-handcorner of the plates. Four days later a single shot from an8-in. rifie was fired at the centerof each plate. In the second 7 in. respectively ; the second and third s(uck after pene-trating in. and in. respectively. The front bulgeaveraged a little more than an inch ; the back bulge wasfrom 4 to 6 in. The 8-in. shot formed a in. crater inback of plate. There were no visible cracks on the Compound Plate.—The first three projectiles, onthe first days trial, perforated the plate and lodged in theoak backing. The fourth passed through both plate andbacking and broke up. The 8-in. shot tore a hole through. Niclcl StAneida: CamnulL, FIG. 3. BACKS OF PLATES AFTER THE ANNAPOLIS TRIAL. trial a 2io-lb. Firth armor-piercing shell was thrown by85 lbs. of brown prismatic powder, with a striking velocityof 1,850 foot-seconds and a striking energy of 4,980 foot-tons. The accompanying figures will give a better idea of theappearance of the plates at the end of the trial than anywritten description can do. To summarize briefly, theeffects of the shot and the behavior of the plates were asfollows : Schneider AU-Sleel Plate.—The first projectile pene-trated about 10 in. and stuck, apparently uninjured. Thepenetration of the other three was about 12 in. in eacncase. All rebounded, two remaining intact except for alittle shortening, the other breaking up into 5 or 6 8-in. shot penetrated about 15 in., rebounded andbroke into three large pieces. About each shot-hole therewas a front bulge of about i in. and a projecting fringe,and a back bulge about
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
