. The railroad and engineering journal . t, of nickel ; 2. A Vickers solid steel,rolled and hydraulic pressed, but untempered plate ; Brown (Ellis) compound plate, The backing was 12 ing ; three of the projectiles rebounded, one partiallybreaking up, the others in good condition. The minimumpenetration was i-i the pointof one projectile get-ting 3 in. beyond the back of the plate before were a number of through cracks, one corner beingpretty well broken up. The Broivn Plate.—The minimum penetration was 13in.; two projectiles stuck in the plate, their bases project-in
. The railroad and engineering journal . t, of nickel ; 2. A Vickers solid steel,rolled and hydraulic pressed, but untempered plate ; Brown (Ellis) compound plate, The backing was 12 ing ; three of the projectiles rebounded, one partiallybreaking up, the others in good condition. The minimumpenetration was i-i the pointof one projectile get-ting 3 in. beyond the back of the plate before were a number of through cracks, one corner beingpretty well broken up. The Broivn Plate.—The minimum penetration was 13in.; two projectiles stuck in the plate, their bases project-ing 2j in. and 3 in. from its face ; three passed entirelythrough both plate and backing. There were a numberof through cracks and -some breaking away of the metalaround the shot-holes. Vol. LXV, No. 7.] ENGINEERING JOURNAL. 323 center A continue to describe arcs with radii A 3, A 4, A 5,etc., cutting the corresponding radii 3, 4, 5, etc., in the pointsc, d, e, etc. These will be points in the curve, which can thenbe drawn through Fig. 272. It is plain that a spiral of any numberof revolutions aroundits center may be drawn by continuing it outside of the circleI, 2, 3-12, by the method described.* Problem 96. To draw an approximate or false spiral. Lay off a central square abed, fig. 273. Then from </ as acenter and d A 3,s 3, radius draw the arc A e. Next with a eas a radius and o as a center draw e f. Again, with b f as a
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
