Makch, 1918 
FOREST AND STREAM 
171 
cannot be greater than its terminal ve¬ 
locity. If its velocity is greater than its 
terminal velocity, as would be the case if 
the bullet were fired vertically downward, 
the resistance of the air upon it (being 
greater than the weight of the bullet) 
would reduce its velocity, if given suffi¬ 
cient time in which to act, to its terminal 
' elocity. That is, if the bullet is fired 
from an airplane at a sufficient height, the 
velocity of the bullet will be reduced to its 
terminal velocity before reaching the earth. 
If the velocity is less than its terminal ve¬ 
locity, the resistance of the air upon it (be¬ 
ing less than the weight of the bullet) will 
permit gravity to increase its velocity until 
it equals its terminal velocity. The resist¬ 
ance of the air may be readily calculated 
by Formula ioa, page 44, Bevis & Dono¬ 
van's Practical Exterior Ballistics. The 
terminal velocity may be determined by 
solving for Vn in that formula or more 
easily by the following - 
gXC 
Vn=:-in which g equals 32.16, V11 
A 
the terminal velocity and C the ballistic co¬ 
efficient of the bullet. The values of A 
md n are found on page 43 in the book 
mentioned. Using the Springfield .30-150- 
2700-C .389 the value of n is 2, because the 
terminal velocity is less than 790 f. s. 
If the bullet falls point donward or is 
’hot downward, C equals .389 and solving 
he formula, using logarithms for conven- 
ence, 
ve have log g — 1.50732 
log .389 = 1.58995 
colog A =4.33011 
2) 5.42738 
Terminal velocity = 2.71369 = 517 foot 
econds. Using the excellent formula for 
ner gy, as given by the same authors, we 
ave 
. = 0.0000022222 M V 2 , we have energy 
quals 84 ft. lbs. 
If the bullet falls base downwards, as it 
■ould if shot vertically upwards, the value 
f c (small), the coefficient of resistance, 
ecomes 2, and then C becomes 0.117. 
sing this value of C in the preceding 
irmula, we get terminal velocity equals 
I5 f. s. and the striking energy equals 27 
. lbs. approximately. It is quite evident 
ia t the penetration in either case would 
slight. j. r. Bevis, Ph.D. 
■ L., Ilion, N. Y.: 
Mr. Miller states in his book, page 73, 
at the recoil of a certain rifle is twenty- 
o hundred ft. pounds. Can that be true? 
■^ nS- Mr. Miller undoubtedlv meant 22 
pounds. 
Q~ He a ^ so states on page 100 that if a 
■ rifle be shot at 200 yards with the sights 
t at zero, the bullet would drop only or 
proximately twenty-one inches. Can 
it be true? 
A.ns.—Assuming that Mr. Miller meant 
J regular .22 Long Rifle cartridge we 
’uld say that the drop of the bullet 
•uld be approximately forty-seven inches, 
the rifle was sighted on the bull’s-eye 
200 yards by centering it through the 
-e the drop of the bullet would be about 
inches. 
Can you tell us anything about the 
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'ms.—No. 
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