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 . Figure 26. unices the effect of the wind were allowed for in pointing. If the line of fire be 37*true, and the wind be blowing from 310° true at 23 knots,_the wind component per-pendicular to the line of fire would be 23 sin 87°, or (by the use of the traverse tables) 23 knots, and the sFoTwbuTdTfall —rr^— =27 yards to the right of the target. 13 194 EXTERIOR BALLISTICS Col. 17, gunmotion indeflecti
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 . Figure 26. unices the effect of the wind were allowed for in pointing. If the line of fire be 37*true, and the wind be blowing from 310° true at 23 knots,_the wind component per-pendicular to the line of fire would be 23 sin 87°, or (by the use of the traverse tables) 23 knots, and the sFoTwbuTdTfall —rr^— =27 yards to the right of the target. 13 194 EXTERIOR BALLISTICS Col. 17, gunmotion indeflection. 321. Column 17. Deviation for Lateral Motion of Gun Perpendicular to lineof Fire, Speed 12 Knots.—This column is also constantly used. For our standardproblem 12 gun, at 10,000 yards, if the gun be moving at 12 knots perpendicular tothe line of fire, and from right to left, the shot would fall 70 yards to the left of the. Figure 27. target unless the motion were allowed for in pointing. If the line of fire be 37° true,and the firing ship be steaming 100° true at 21 knots, the component of this motionperpendicular to the line of fire would be 21 sin 63°, or (by use of the traverse tables) knots to the right, and the shot would fall 12 109 yards to the right. RANGE TABLES; THEIR COMPUTATION AND USE 195 get motion indeflection. 322. Column 18. Deviation for Lateral Motion of Target Perpendicular to coi. is. tar-line of Fire, Speed 12 Knots.—Tliis column is also constantly used. Note that thechange of range in yards for the given speed when the target is moving in the line offire is always the same numerically as the deviation in yards for the same speed whenthe motion is perpendicular to the line of fire. This is manifestly correct, as themotion of the target, unlike any of the other motions considered, has no effect uponthe actual motion of the projectile relative to the ground. This mo
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectballistics, bookyear1
