THE ROYAL ARTILLERY INSTITUTION. 
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(6) The range of the 16-pr. gnn is observed to be 3139 ft. What 
is its striking velocity and time of flight; the muzzle velocity being 
1358 f.s., weight of shell 16 lbs., diameter 3*54 ins.? 
f n 
- s = *7832 x 3139 log *7832 = 1*8939 
w 
= 2458 log 3139 = 3*4967 
log- 1 3*3906 = 2458 
Corresponding to velocity 1358 f.s. in Table I., 
1558*4 
2458*0 
lofo'I 
which corresponds to 1011 f.s. velocity on impact. 
Again, 
— t = '7832^. 
w 
Corresponding to velocity 1011 is 3*1653 
Do., 
do., 
1358 » 1*0272 (Table II.) 
Subtracting, 
2-1381 
.*. t = 
2*1381 
*7832 " 
0 - Qft log 2-1381 = -3300 
- 2 730 secs. log -7832 = 1-8939 
log- 1 -4361 
Mas. beigbt of t'.&tor, -f . «£»£ log 2'780 = -4362 
29*99 ft. 
*8724 
log g = 1*5077 
2*3801 
log 8 = *9031 
log' 1 1*4770 = 29*99 
Approximate Method oe Finding Trajectories. 
Find the trajectory of the Martini-Henry rifle at 500 yds. Weight of 
bullet = 480 grs., diameter of bore = *45 in., muzzle velocity = 1353 f.s. 
First, by Table I. the velocity can be found at every 100 ft. 
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