The Modern Rifle ...The Authors, 1917 - Ballistics |
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Page 10
... Danger Zone .......... X. The Influence of Barometric 51 5528 61 73 79 Pressure , Altitude , Temperature and Humidity upon the Ballistics of a Projectile .............. 87 XI . Winds , Their Influences and Correction .... 99 XII ...
... Danger Zone .......... X. The Influence of Barometric 51 5528 61 73 79 Pressure , Altitude , Temperature and Humidity upon the Ballistics of a Projectile .............. 87 XI . Winds , Their Influences and Correction .... 99 XII ...
Page 78
... vertical range will be slightly less than 2000 yards . ( Shooting downward these ranges are increased ) . To calculate maximum vertical range see Chap . X. A CHAPTER IX . The Danger Zone . Problem 14A 78 THE MODERN RIFLE.
... vertical range will be slightly less than 2000 yards . ( Shooting downward these ranges are increased ) . To calculate maximum vertical range see Chap . X. A CHAPTER IX . The Danger Zone . Problem 14A 78 THE MODERN RIFLE.
Page 79
... 6 inches or 0.5 ft . , h = y ' = y " = 0.5 ft . and T the time of flight for 500 yards . or t ' C = ( T + = √ ( H - Y ) › 1 2 √ ( H − y ) › For . 25a Using for illustration the value of T for the Springfield IX The Danger Zone.
... 6 inches or 0.5 ft . , h = y ' = y " = 0.5 ft . and T the time of flight for 500 yards . or t ' C = ( T + = √ ( H - Y ) › 1 2 √ ( H − y ) › For . 25a Using for illustration the value of T for the Springfield IX The Danger Zone.
Page 81
... danger zone is that zone or zones over which the projectile in its flight is neither above nor below the limits of the vital zone of the animal aimed at . The danger zones of the antelope , Problem 14A , extends from M to y , and from y ...
... danger zone is that zone or zones over which the projectile in its flight is neither above nor below the limits of the vital zone of the animal aimed at . The danger zones of the antelope , Problem 14A , extends from M to y , and from y ...
Page 82
... danger zone of the larger animal would extend from M to y ' " . In the first case the danger zone of the antelope is discontinuous , in the second case the danger zone of the animal is continuous . For hunting purposes the danger zone ...
... danger zone of the larger animal would extend from M to y ' " . In the first case the danger zone of the antelope is discontinuous , in the second case the danger zone of the animal is continuous . For hunting purposes the danger zone ...
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Common terms and phrases
12 o'clock wind 25 yards accuracy altitude angle of departure approximately axis ballistic coefficient barometric pressure bore bullet calculated caliber cartridge center of impact CHAPTER chronograph computed conical correction curve danger zone deflection in inches degrees determine diameter difference disc distance elevation of sights energy flight free recoil gravity greater head height Hence horizontal range hundreds of yards hunter illustration inclined range increases Interior Ballistics jectile less line of sight maximum vertical range mile wind muzzle velocity National Rifle Association Newton o'clock wind equals ogival oloidal paraboloidal planet point blank range powder charge Problem projectile travels range in hundreds rear sight remaining velocity Remington resistance rifleman rotation sea level shooting shots sighted for 200 smokeless powders solid of revolution Springfield TABLE 1-(Continued target temperature tion trajectory Uranus vertical deviation vital zone windage
Popular passages
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.