HITTING THE MARK, ETC. 
11 
The new Indian bronze gun, 3-inch 9-pr., also exhibited 
greater unsteadiness when fired with 1 J lb. of powder than with 
1 i lb. charge. It is remarkable for both these guns, that the 
resistance of the air is most variable when the velocities are 
the highest. It has generally been found that accurate practice, 
or “ beautiful hitting,” has been best obtained when the charge 
is exactly suited to the weight of the ball, so as to fire it with 
the least irregularity of atmospheric resistance and greatest 
steadiness of flight. 
This resistance, according to Professor Bashforth’s researches, 
acquires enormous proportions (Report, p. 121). 
Table (abstracted) 
Shoving the resistance of the air in lbs. to spherical shot from 1 to 15 inches 
in diameter, at velocities varying from 900 to 2100 f. s. (feet per second), 
calculated by means of Table Y. 
Velocity 
f. s. 
Resistance 
V elocity 
f. s. 
3 in. 
5 in. 
7 in. 
9 in. 
13 in. 
14 in. 
15 in. 
900 
1300 
1700 
2100 
lbs. 
28 
91 
166 
257 
lbs. 
78 
252 
461 
713 
lbs. 
153 
494 
903 
1398 
lbs. 
254 
817 
1493 
2311 
lbs. 
529 
1705 
3115 
4823 
lbs. 
613 
1977 
3613 
5593 
lbs. 
704 
2269 
4148 
6421 
900 
1300 
1700 
2100 
Table oe Striking Velocities at dieferent Distances on Hitting 
the Mark. 
Diam. of shot, 8-92 inches. Weight of shot, 250 lbs. 
Distances 
Velocities, feet per second 
from gun 
0 
100 
200 
300 
400 
500 
600 
700 
800 
900 
feet 
f. s. 
0 
1400 
1394 
1387 
1381 
1375 
1368 
1362 
1356 
1350 
1344 
1000 
1338 
1332 
1326 
1320 
1315 
1309 
1303 
1298 
1292 
1287 
2000 
1281 
1276 
1271 
1265 
1260 
1255 
1250 
1244 
1239 
1234 
3000 
1229 
1224 
1219 
1214 
1209 
1205 
1200 
1195 
1191 
1186 
4000 
1181 
1177 
1172 
1167 
1163 
1159 
1154 
1150 
1145 
1141 
5000 
1137 
1133 
1128 
1124 
1120 
1116 
1112 
1108 
1104 
1100 
6000 
1096 
1092 
1088 
1085 
1081 
1077 
1073 
1070 
1066 
1062 
7000 
1059 
1055 
1052 
1048 
1045 
1041 
1038 
1035 
1031 
1029 
8000 
1025 
1021 
1018 
1015 
1012 
1009 
1006 
1003 
1000 
997 
9000 
994 
991 
988 
985 
983 
980 
977 
974 
972 
969 
10000 
967 
965 
962 
960 
957 
955 
953 
950 
948 
945 
