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 . ING THE MEAN DISPERSION. PEOBLEM. Cal. = 8; 7 = 3750 f. s.; w = 2G0 pounds; c=; Actual range = 8500 yards; Sightsset at, in range, 8500 yards; in deflection, 40 knots; Center of bulls eye abovewater, 12 feet; Bearing of target from gun, 37° true; Wind blowing from 350°true, with velocity of 8 knots an hour; Barometer = ; Thermometer= 80° F.; Temperature of powder=100° F.; Weight of shell =
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 . ING THE MEAN DISPERSION. PEOBLEM. Cal. = 8; 7 = 3750 f. s.; w = 2G0 pounds; c=; Actual range = 8500 yards; Sightsset at, in range, 8500 yards; in deflection, 40 knots; Center of bulls eye abovewater, 12 feet; Bearing of target from gun, 37° true; Wind blowing from 350°true, with velocity of 8 knots an hour; Barometer = ; Thermometer= 80° F.; Temperature of powder=100° F.; Weight of shell = 268 pounds;Number of shot = 4, fallino; as follows: Range. Deflection. Shot. 1 100125 8590 .... .... 85 9 80 3 60 4 55 Mean errors on footof perpendicularthrough bulls 4| short 4|280 left Correction in range due to height of bulls eye:100 31 X12 = vards over Correction in deflection due to intentional displacement:80 12 Temperature of powder: + 3510 X 10 = yards left X 10 = +35 foot-seconds Use Table IV for density correction and traverse tables for resolution of windforces. 314 APPENDICES m-nd J Lme of TA/ZGk£^T. Observed distance from target in range yards short. Error (wliere shot should have fallen; Vards over. True mean error in range under standard conditions yards short. Observed distance from target in deflection vards left. Error (where shot should have fallen) vards left. Wind - to Range Range Range Range Range o ,- 31 X 318COS4. X^j2=—12- „ . ,_ ^^ 17 X 178sm4/x-j2=—^2— 41 «x-^ .318 X 229or standard conditions Densitv Initial velocity .. Height of bullseve .... Intentional deflec-tion Errors on point P as an oriein f 58 3 True mean error in deflection under standard conditions. yards left. APPENDICES 315 That
Size: 1702px × 1469px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectballistics, bookyear1
