The groundwork of practical naval gunnery; a study of the principles and practice of exterior ballistics, as applied to naval gunnery, and of the computation and use of ballistic and range tables . knots or, to nearest graduations of sight scales, remembering to shoot short rather than over, In range 8350 yards In deflection 63 knots Real wind 328. A 12 guu (7 = 2900 f. s., ?i; = 8T0 pounds, c = ) mounted on board a ^Ifrowem: sliip steaming 45° (magnetic) at 18 knots, is to be fired at a target ship on the star-board bow of the firing ship and steaming 315° (magnetic) at 14 knots, at themo
The groundwork of practical naval gunnery; a study of the principles and practice of exterior ballistics, as applied to naval gunnery, and of the computation and use of ballistic and range tables . knots or, to nearest graduations of sight scales, remembering to shoot short rather than over, In range 8350 yards In deflection 63 knots Real wind 328. A 12 guu (7 = 2900 f. s., ?i; = 8T0 pounds, c = ) mounted on board a ^Ifrowem: sliip steaming 45° (magnetic) at 18 knots, is to be fired at a target ship on the star-board bow of the firing ship and steaming 315° (magnetic) at 14 knots, at themoment when the firing ship is 9530 yards from the point of intersection of the two xJ RANGE TABLES; THEIR COMPUTATION AXD USE 199 courses, and the target ship is 5500 yards from the same point. The l)arometer is at28,25 and the thermometer at 80° F. The tem])erature of the ]K)\vder is 105° of the powder has reduced the initial velocity, at standard temperature, to2875 f. s. The shell is pounds over weight. Tliere is a real wind blowing ^nm260° by compass (Dev. 10° E.) at 20 knots. How should the sights be set to hit ? /l^- ^c^^ /^ha /^rr \«* 3^j>- > / o/ \^. 0 ^ \. Figure 30 By use of the traverse tables, at the moment of firing, the target will be 30° onthe starboard bow of the firing ship, distant 11,000 yards. 15Temperature of powder 35 x :r^ + f. s. Dampness — f. s. Total variation in initial velocity + f. s. For the given atmospheric conditions, 8 = , and the air is therefore percent below standard density. Use the traverse tables for all resolutions of speeds. / 200 EXTEEIOR BALLISTICS Cause of error. Affects. Formulap. Range. Deflection. Variation in orspeed of— Over. Yds. Gun •{ Range Range Range 6218 cos 30 X ^ = 93 cos 30 IS sin 30 X -|^ = sin 30 9414 cos 60 X -r:7 = cos 60 9414 sin 60 X -Tp = si
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectballistics, bookyear1
