The Modern Rifle ...
The Authors, 1917 - Ballistics
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accuracy altitude angle of departure approximately assume atmosphere average axis ball ballistic barrel body bore bullet calculated cartridge cause CHAPTER charge computed construction correction curve danger zone deflection determine diameter difference disc distance divide earth effect elevation energy equals error expressed fact factor fall feet fire flight foot force formula given gives gravity greater greatest head height Hence hold horizontal hundreds hunter illustration inches inclined increases influence jectile known lateral length less mark mathematics maximum mean measured miles minute moves muzzle velocity o'clock wind ogival path planet point blank range powder practical principle Problem produce projectile radius range remaining represents resistance result rifle rotation rule shooting shots space strike TABLE TABLE 1-(Continued temperature tion trajectory travels variation varies vertical vertical deviation yards zero
Page 18 - Newton generalized the law of attraction into a statement that every particle of matter in the universe attracts every other particle with a force which varies directly as the product of their masses and inversely as the square of the distance between them; and he thence deduced the law of attraction for spherical shells of constant density.
Page 171 - FRACTION is a negative number, and is one more than the number of ciphers between the decimal point and the first significant Jigure.
Page 173 - To extract the root of a number, divide the log of the number by the index of the root, and take the antilog of the quotient.
Page 120 - ... although the gun had lost its effectiveness after Group B was fired (when overheating started). After Group D was fired the barrels were allowed to cool. They were then fired and gave accurate results. The shot groups were as small as those made when the barrel was first used and there was no change in the distance of the center of impact from the center of the target.
Page 23 - Units of Work; the Foot-pound.— It is often necessary to represent work numerically; hence the necessity for a unit of measurement. The unit commonly in use, for the present, in England and this country is the foot-pound.
Page 111 - ... to the right of its course in the northern hemisphere, and to the left of its course in the southern hemisphere.
Page 173 - Log. 4,000, 3.612360; one-third of this is 1.204120, to which the corresponding number is 16, which is the root sought. 12. When the characteristic is negative, and not divisible by the index, add to it the smallest negative number that will make it divisible, and then prefix the same number, with a plus sign, to the mantissa. Example.
Page 17 - Isaac announced that an apple falls to the earth because every particle of matter in the universe has an attraction for every other particle. Think carefully what this means; it is a most astonishing statement. All bodies of matter pull other bodies of matter toward themselves. The earth attracts the apple and it falls; 1 One little girl when asked the meaning of this sentence replied, " The force tries to produce motion.
Page 24 - Sight, abf, is the straight line passing through the sights and the point aimed at. The Line of Departure, be, is the prolongation of the axis of the bore at the instant the projectile leaves the gun. The Plane of Fire, or Plane of Departure, is the vertical plane through the line of departure. The Angle of Position, e, is the angle made by the line of sight with the horizontal.
Page 125 - the panoramic sight is set at zero the vertical plane through the line of sight is parallel to the axis of the bore.