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 . 7 = yards logT^ = Ta log T log A/e r =D r (19) H= feet log Z = 300 log tan w — 10 log/f,oo = = = = = = Dr = = feet. APPENDICES 305 Form No. 25A. CHAPTER 17—EXAMPLE 8. FORM FOR THE SOLUTION OF REAL WIND AND SPEED PROBLEMS. PROBLEM.
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 . 7 = yards logT^ = Ta log T log A/e r =D r (19) H= feet log Z = 300 log tan w — 10 log/f,oo = = = = = = Dr = = feet. APPENDICES 305 Form No. 25A. CHAPTER 17—EXAMPLE 8. FORM FOR THE SOLUTION OF REAL WIND AND SPEED PROBLEMS. PROBLEM. Cal. = S; r = 2:50 f. s.; u = 2C^0 pounds; c = ; Ranges7500 yards; Real wind, direction from, 225° true; velocity, 15 knots an hour; Motion of gun, course, 355° true; speed, 20 knots an hour; Motion of target, course, 330° true; speed, 25 knots an hour; Target at moment of firing, 75° true; distant, 7500 yards; Barometer = ; Thermometer = 10° F.; Temperature of powder = 75° F,; Weight of projectile = 263 pounds. — 35Temperature of powder, ^r^ x 15 = — foot-seconds. Use Table IV to correct for density. Use traverse tables for resolution of windand speeds. (Pun a/. l/77£ o/~ F/r^ Wind 20 306 APPENDICES Affects. Formulae. Errors in— Cause of of or varia-tion in. Range. Deflection. Short. Over. Right. Left. Yds. Yds. Yds. Yds. r Range 2oco,sox«-^?^r .... . • • Guu - I 20si„8OX^:->,f^ r Range 68 X 6825 cos 65X^ = Y2 .... Target ?> 25s,„65xj:-%^^ .... Range >5cos30xS-r/* .... Wind - „30x;.^-,f^ Initial velocity .. Range X5„ .... w Range Range 3x4i 0 X ISO Density 12 iO 9 vnrrle ^ — (^ •} l- nots on deflection scale. -^ 68 - • ^ Set sights at: Exactly in range, yards; in deflection, knots. Actually in range, yards; in deflection, knots. Rememb
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectballistics, bookyear1
