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 . l- nots on deflection scale. -^ 68 - • ^ Set sights at: Exactly in range, yards; in deflection, knots. Actually in range, yards; in deflection, knots. Remember to shoot short rather than over. APPENDICES 307 Form No. 25B. CHAPTET^ 17—EXA]\[PLE 8. FORM FOR THE SOLUTION OF REAL WIND AND SPEED PROBLEMS. PEOBLEM. Cal. = 8; 7 = 2750 f. s.; w = 260 pounds; c =
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 . l- nots on deflection scale. -^ 68 - • ^ Set sights at: Exactly in range, yards; in deflection, knots. Actually in range, yards; in deflection, knots. Remember to shoot short rather than over. APPENDICES 307 Form No. 25B. CHAPTET^ 17—EXA]\[PLE 8. FORM FOR THE SOLUTION OF REAL WIND AND SPEED PROBLEMS. PEOBLEM. Cal. = 8; 7 = 2750 f. s.; w = 260 pounds; c = ; Ea]ige = 7000 yards; Eeal wind, direction from, 160° true; velocity, 20 knots an hour; Motion of gun, course, 260° true; speed, 18 knots an hour; Motion of target, course, 170° true; speed, 23 knots an hour; Target at moment of firing bearing, 115° true; distant, 7000 yards; Barometer = ; Thermometer =85° F.; Temperature of powder = 95° F.; Weight of projectile = 258 pounds. + 35Temperature of powder, ^ttt- X 5= + foot-seconds. Use Table IV for correction for density. Use traverse tables for resolvingspeeds. 6rU7\. 308 APPENDICES Cause of of or vari-ation in. Gun. Target. Wind Initial velocity . .. Density. Affects. Range Range Range 12 Formulae. iQ or 42 X 4218 cos 35 X ^ = ~ 52 X 52 18 sin 35 X23 cos 55 X 12 ~ 1263 X 03 12 12 «o • rr 63 X 6323 sm 55X^2 =—12— 20 cos 45 X20 sin 45 X X 21 X2112 ~ 12 11 X 11 12 10750 12 432X-5- .69 X 157 67 yards X ?7r;r=^ 12. 8 knots on deflection Errors in — Ransre. Over. Yds. Deflection. 44 44 Set sights at: Exactly in range, 6951 yards; in deflection, knots. Actually in range, 6950 yards; in deflection, knots. Remember to shoot short rather than over. APPENDICES 309 Form No. 26.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectballistics, bookyear1
