PRECIS 
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“RUSSIAN ARTILLERY JOURNAL.” 
| 
No. 4, April 1894. 
THE RESISTANCE OF THE AIR AT HIGH 
VELOCITIES. 
BY 
CAPTAIN ZABUDSKI, Russian ARTILLERY. 
TRANSLATED BY 
MAJOR G. T. KELAART, R.A. 
From the experiments with elongated projectiles carried out by himself, Bash- 
forth and Krupp, General Mayevski concluded that the air resistance, for velo- 
cities less than 240 metres per second and greater than 419 metres per second, is 
proportional to the square of the velocities; but near the velocity of sound, 340 
metres per second, it increases according to a higher power than the second. 
In 1884, Colonel Hojel of the Dutch Artillery concluded, from experiments 
in Holland and at Krupp’s works, that for velocities exceeding 500 metres per 
second the resistance increases according to a lower power than the square; from 
his determination the power was equal to 1:91 between 500 and 700 metres per 
second. : 
In 1890 Krupp issued tables, giving resistances for velocities up to 700 metres 
per second, found from experiments with guns of various calibres ; the velocities 
being determined at two points of the trajectory. 
From these tables it appears that for velocities above 550 metres per second the 
resistances increases according to a lower power of the velocity than the square : 
from 550 metres per second to 800 metres per second the power is 1°70, from 
800 metres per second to 1000 metres per second it is 1°55. 
From Krupp’s experiments, published in 1881, General Mayevski deduced the 
resistances inserted in his memoir—‘‘ The solution of problems of direct and 
curved fire,’ 1882. 
These tables gave the resistances for velocities up to 700 metres per second, 
and the 1890 tables continued them. 
Making use of these tables, I have deduced expressions for resistances at velo- 
cities up to 1000 metres per second. Connecting them with the 1882 formule 
B WOlin TORR 
