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 24. moving in the opposite direction it would undershoot by the same amount. If theline of fire be 37° true, and the firing ship be steaming 315° true at 20 knots, thecomponent speed in the line of fire would be 20 cos 82°, or (by the use of the traverse tables) 2,8 knots towards the target, and the gun would overshoot ^ \j, = / 192 EXTEEIOR BALLISTICS Col. 15, tar-get motionin rang
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 24. moving in the opposite direction it would undershoot by the same amount. If theline of fire be 37° true, and the firing ship be steaming 315° true at 20 knots, thecomponent speed in the line of fire would be 20 cos 82°, or (by the use of the traverse tables) 2,8 knots towards the target, and the gun would overshoot ^ \j, = / 192 EXTEEIOR BALLISTICS Col. 15, tar-get motionin range. 319. Column 15. Change of Range for Motion of Target in Plane of Fire of12 Knots.—This column is also constantly used. For our standard problem 13 gunat 10,000 yards, if the target be steaming directly towards the gun at 12 knots, thegun would overshoot the mark 84 yards unless the motion were allowed for in point-ing; and if it were steaming at the same rate in the opposite direction it would under- MorfK. Figure 25. shoot by the same amount. If the line of fire were 37° true, and the target weresteaming 175° true at 33 knots, the component of motion in the line of fire would be23 cos 42°, or (by the use of the traverse tables) knots toward the gun, and the gun would overshoot ^^ == yards. 12 / EANGE TABLES; THEIE COMPUTATION AND USE 193 320. Column 16. Deviation for Lateral Wind Component of 12 Knots.—Thiscolumn is also constantly used. For our standard problem 12 gun at 10,000 yards,if the wind were blowing perpendicular to the line of fire and across it from right toleft, with a velocity of 12 knots, the shot would fall 14 yards to the left of the target Col. 16, windin deflection. NarrA.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectballistics, bookyear1
