ELOCI

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[Transl

VELOCI

ts made in >rth, and in ce of the air è conclusion

240 meters ares of the velocity of r rate than

ame to the Holland and or velocities ares of the increase is

rs.

e stated the

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[Transl

RESISTANCE OF THE AIR FOR GREAT VELOCI

TIES OF PROJECTILES.

Translated from the Russian.

1. According to results obtained by experiments made in Russia by General Mayevsky, in England by Bashforth, and in Germany by the Krupp works, touching the resistance of the air to oblong projectiles, General Mayevski came to the conclusion that the resistance of air for velocities smaller than 240 meters and greater than 419 m., is proportional to the squares of the velocities, and that for velocities approximating the velocity of sound (340 m.), the resistance increases at a greater rate than the squares of the velocities.

In 1884 Hojel, Colonel of the Dutch artillery, came to the conclusion, based on results of experiments made in Holland and at the Krupp works, that the resistance of the air for velocities above 500 meters increases less rapidly than the squares of the velocities; according to his calculations the degree of increase is equal to 1.91 for velocities between 500 and 700 meters.

In 1890 the Krupp works issued tables in which are stated the amount of resistance of the air for successive velocities up to 1000 meters.

These data were obtained by the Krupp works by firing with guns of various calibers, and by determining the velocities of the projectile at two different points of the trajectory.

By an examination of these tables it may be concluded that for velocities greater than 550 meters the resistance increases less rapidly than the squares of the velocities. I have expressed this ratio of increase by 1.70 for velocities between 550 and 800 meters and by 1.55 for velocities between 800 and 1000 meters. According to results of experiments published by the Krupp works in 1881, General Mayevsky deduced an expression for the resistance of the air as stated in 1882 in his brochure "Solution of problems in sighting and in slant firing."

In the above tables the resistance is given for velocities under 700 meters. The table cited in 1890 is a continuation of the preceding ones.

Journal 47.