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 . e 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. t
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 . e 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 motion of the targetsimply removes the target from the point aimed at by an amount equal to the dis- /^ar/^. Figure 5j8. tancc traveled by it during the time of flight. For our standard problem VI gun at10,000 yards, if the target be moving at 12 knots perpendicular to the line of fire,from right to left, the shot would fall Sf yards astern of, that is, to the right of thetarget unless allowance were made for this motion in pointing. If the line of fire be37° true, and the target be steaming 180° true at 20 knots, then the component ofmotion perpendicular to the line of fire would be 20 sin 37°, or (by the use of the traverse tables), 12 knots to the left, and the shot would fall M2<JJ =84 yards tothe left. 12 196 EXTERIOR BALLISTICS Relation be- 323. There is another most important use to which the data contained in this tion in yards column is Constantly put, and that is the determination
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectballistics, bookyear1
