Title: The railroad and engineering journal
Year: 1887 (1880s)
Subjects: Railroad engineering Engineering Railroads
Publisher: fresh York : M.N. Forney
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation
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t, of nickel ; 2. A Vickers solid steel,rolled and hydraulic pressed, but untempered plate ; 3.A Brown (Ellis) compound plate, The backing was 12 ing ; three of the projectiles rebounded, one partiallybreaking up, the others in Great condition. The minimumpenetration was 11.75 i-i the pointof one projectile get-ting 3 in. beyond the back of the plate before rebounding.There 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 them.
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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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