THE ROYAL ARTILLERY INSTITUTION. 
325 
(1) To find time over 100 yds. range = 300 ft. 
— t — 2*953^ = ‘6955, Table II. for vd. 1198 = 1*7416 
w i, 1353 = 1-0461 
, -6955 . 00 _ _ 
t — - 0 — 23o6 sec. . aqkk 
2-953 -6955 
(2) Time over 200 yds. 
2*953^ = 1-4826 
.*. t— -5021 sec. 
(3) Time over 300 yds. 
2-953^ = 2-3424 
.*. t— -7934 sec. 
(4) Time over 400 yds. 
2-953^ = 3-2592 
.*. t = 1*104 sec. 
(5) Time over 500 yds. 
2-953^ = 4-2301 
.-. t = T.432 sec. 
for vel. 1075 = 2-528? 
„ 1353 = 1-0461 
1-4826 
for vel. 904 = 3-3885 
„ 1353 = 1-0461 
2-3424 
for vel. 937 = 4‘3053 
* 1353 = 1-0461 
3-2592 
for vel. 889 = 5-2762 
„ 1353 = 1-0461 
4-2301 
These results may be thus expressed^ for the sake of clearness :—- 
Distance. 
1 
V elocity. 
Time. 
vds. 
f.s. 
secs. 
0 . 
1353 
•0000 
100 . 
1198 
•2356 
200 . 
1075 
•5021 
300 .. 
994 
•7934 ■ 
400 .. 
937 
1-1040 ! 
500 . 
889 
1-4320 i 
When the time over a given range is known, the corresponding 
height of trajectory is given by the equation 
W-t)-, 
where T is the whole time of flighty and t the time over given range. 
