Caption: War Publications - WWI Compilation 1923 - Article 46
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Ani|k of Depart urv Air Vacuo (appr.) Air Vacuo (appr.) Air Vacuo (appr.) Air Vacuo (appr.) Air VACUO Muzzle Velocity Range Maximum Ordinate 17.3 f t 19.4 ft. 93.1 ft. 119.2 ft. 257.0 ft. 370.9 ft. 536.0 ft. 853.8 ft. 975.0 ft. 1604.0 ft. Time of Plight 2.07 sec7~ 2.20 sec. 4.46 sec. 4.75 sec. 7.83 sec. 9.63 sec. 11.25 sec. 14.61 sec. 15.12 sec. 20.58 sec. 1° 11.2' 2° 56.7' 2° 50.7' 5° 12' 6° 12' 7° 5 1.2' 7° 54.2' 11° 10.1' 11° 10.1' 1700 ft. sec. 1000 yds. L700 ft. sec. 1245 yds. 1700 ft. sec. 2000 yds. 1700 ft. sec. 3089 yds. 1700 ft. sec. 3000 yds. 1700 ft. sec. 5434 yds. 1700 ft. sec. 4000 yds. 1700 ft. sec. 8200 yds. 1700 ft. sec. fiOOO y d s . 1700 ft. sec. 11140 yds. (appr.) The table brings out clearly the great flatness of the trajectory at ordinary ranges. For a rough construction of the ballistic curve, the abscissa corresponding to the maximum ordinate may be assumed three1 fifths of the horizontal range. (See "Definitions/ below). Definitions (see Fig. i ) : Let G in Fig. i be the gun (more accurately the muzzle of the gun), T the target, GN a horizontal line, GB a tangent to the curve at G ; then Curve GTN = trajectory (in vacuo a parabola, in air the "ballistic curve"), GN = horizontal range, GT = range (as a length) ; also line of sight; line of position, ZNGT — c, angle of site, angle of position, GB = line of departure,. LTGB = <f>, angle of departure, INGB = <f> + € = < quadrant angle of departure,* % / LTGA = *', angle of elevation, /JNGA = <P' + c, quadrant angle of elevation,*
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