PRINCIPLES OE GUNNERY. 
249 
Example (4).—A shell fired from the 61<-pr. M.L. gun with a charge 
of 10 lbs. of powder was observed to strike the crest of a parapet in 
3 secs.; the muzzle velocity is known to be 1383 f.s. Find the 
striking velocity and the range. 
In this case, w — 64 lbs., d — 6*22 ins., V = 1383 f.s., I 7 — 3 secs. 
Substituting in equation (II.), 
Ty\ 
— T— T v 
w 
64 
or T v = 1-814 + ’9351 (since T im 
or -—— X 3 — T v —~ 383 ; 
= 2-7491 secs.; 
•9351 sec. by Table II.); 
then from Table II. v = 1049 f.s. 
i.e ,, the striking velocity at the end of 3 secs, from firing = 1049 f.s. 
Next, to find the range 
Substituting in equation (I.), 
C -S = S v -S vi 
W 
( 6 * 22) 2 a _ « or 
or —^" — ^1049 ““ ^1383 j 
or •6045/S' = 3595-6 — 1432*4; 
or 
2163-2 
' ~ -6045 
3578 ft. 
i.e., the distance of the crest of the parapet from the gun is 3578 ft. 
Table showing the Resistance of the Air in lbs. to Elongated Projectiles with 
Ogival Heads, from 1 in. to 15 ins. in diameter , at velocities of from 900 f.s. 
to 1700f.s. 
Diameter of projectile. 
r2 
i> 
lin. 
2 in. 
3 in. 
4 in. 
5 in. 
6 in. 
7 in. 
8 in. 
9 in. 
10 in. 
11 in. 
12 in. 
13 in. 
14 in. 
15 in. 
o 
"3 
> 
f.s. 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. 
f.s. 
900 
1-4584 
5-8 
131 
23-3 
36-5 
52-5 
71-5 
93-3 
118 
146 
176 
210 
246 
286 
328 
900 
950 
1-7951 
7-2 
16-2 
28-7 
44-9 
64-6 
88 
115 
145 
180 
217 
258 
303 
352 
404 
950 
1000 
2-3299 
9-3 
21 
37-3 
58-2 
83-9 
114 
149 
189 
233 
282 
336 
394 
457 
524 
1000 
1050 
3-3373 
13'3 
30 
53-4 
83-4 
120 
164 
214 
270 
334 
404. 
481 
564 
654 
751 
1050 
1100 
4-3829 
17-5 
39 
70 
110 
158 
215 
281 
355 
438 
530 
631 
741 
859 
986 
1100 
1150 
5-1121 
20-4 
46 
82 
128 
184 
250 
327 
414 
511 
619 
736 
864 
1002 
1150 
1150 
1200 
5-8457 
23'4 
53 
94 
146 
210 
286 
374 
474: 
585 
707 
842 
988 
1146 
1315 
1200 
1250 
6-5952 
26-4 
59 
106 
165 
237 
323 
422 
534 
660 
798 
950 
1115 
1293 
1484 
1250 
1300 
7-3641 
29-5 
66 
118 
184 
265 
361 
471 
596 
736 
891 
1069 
'1245 
1443 
1657 
1300 
1350 
8-1322 
32-5 
73 
130 
203 
293 
398 
520 
659 
813 
984 
1171 
1374 
1594 
1830 
1350 
1400 
8-8650 
35-5 
80 
142 
222 
319 
434 
567 
718 
887 
1073 
1277 
1498 
1738 
1995 
1400 
1450 
9-5556 
38-2 
86 
153 
239 
314 
468 
612 
774 
956 
1156 
1376 
1615 
1873 
2150 
1450 
1500 
10-1902 
40-8 
92 
163 
255 
367 
499 
652 
825 
1019 
1233 
1467 
1722 
1997 
2293 
1500 
1550 
10-7585 
43 
97 
172 
269 
387 
527 
689 
871 
1076 
1302 
1549 
1818 
2109 
2421 
1550 
1600 
11-3245 
45-3 
102 
181 
283 
408 
555 
725 
917 
1132 
1370 
1631 
1914 
2220 
2548 
1600 
1650 
11-9174 
47-7 
107 
191 
298 
429 
584 
763 
965 
1192 
1442 
1716 
2014 
2336 
2681 
1650 
1700 
12-8050 
51-2 
115 
205 
320 
461 
627 
820 
1037 
1281 
1549 
1844 
2164 
2510 
2881 
1700 
Note. —The values of K for spherical shot have also been determined experimentally for velocities 
varying from 850 to 2150 f.s. Also tables of S v and T v have been calculated for spherical shot. (Vide 
“ Proceedings, R.A. Institution/’ Vols. VII. and VIII.) 
