CAUSES OF DRIFT. 247 
Pp Nelerdlar dat iN| 1D) 52g Valsts 
6-in. B.L. Howitzer, 25 ewts.—Projectile : C.S. common shell, weight 
118 lbs., length 27 ins. Fuse: D.A., Mark II. 
Charge : 12 oz. (cordite)— 
Range. Deviation. 
Round. Elevation, yds. Left, yds. Right, yds. 
1 43° 1,659 os 65°8 
2 68° 1,074 162°6 ote 
3 70° 1,122 1914 iA, 
4 69° 38! 1,092 169:0 age 
8 43° 1,753 eee 65-4 
Charge: 15 oz. (cordite)— 
5 69° 35/ 1,342 2370 
6 % 1,370 261°0 
7 ;, 1,393 272-2 
Charge : 12 oz. (cordite)— 
9 57° 1,596 3 95-0 
10 4 1,523 Ae 99-0 
ll 51° 1,739 #7 94-6 
12 4 1,746 ¥ {01°6 
All the shell fired at 70° (about) were found standing on their bases 
and the fuses unfired. They all drifted to the left. This seems to 
verify the idea that the direction of the drift may be taken as a guide 
regarding how the projectile falls. 
BEHAVIOUR DURING FLIGHT, &C. 
Round 1, elevation 43°—Steady throughout and fell point foremost. 
Not recovered. . 
Round 2, elevation 68°—Slightly unsteady at starting, turned broad- 
side on at top of trajectory, and drifted a long way to the left. Not 
recovered. 
Round 3, elevation 70°—Steady at starting; lost in clouds. Not 
recovered. 
Round 4, elevation 69° 38’—Rose steady, began to descend base first ; 
then appeared to get horizontal, drifted rapidly left, and fell one end 
foremost. Found standing (9 ft. deep in ground) on its base at an angle 
of about 65° to vertical. 
Round 8, elevation 43°—Steady and point first. Not recovered. 
Round 9, elevation 57°—Correct up to top of trajectory ; after begin- 
ning to fall appeared horizontal and wavering. Turned vertical about 
150 ft. from ground, could not see whether point or base lowest. Found 
55 ft. underground, nearly horizontal, point 40° to left front and slightly 
lowest. The shell had travelled 9 ft. underground. 
Round 10, elevation 57°—Similar to round 9 as regards flight. It 
travelled 9 ft. underground, found 5 ft. below surface standing on its 
base, no indication of shell having turned over. 
