The Modern Rifle ...The Authors, 1917 - Ballistics |
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Page 83
... vertical vital zone , say deer 8 inches . To determine the point blank range . Allowing for the vertical deviation of the projectile and error in sight , the height , H , of the trajectory should not be greater than 1⁄2 ( 8-2 ) or 3 ...
... vertical vital zone , say deer 8 inches . To determine the point blank range . Allowing for the vertical deviation of the projectile and error in sight , the height , H , of the trajectory should not be greater than 1⁄2 ( 8-2 ) or 3 ...
Page 117
... Deviations . T HE Mean Vertical Deviation is the average ver- tical divergence and the Mean Horizontal the average horizontal divergence of an aggregate of shots from the calculated course of flight . Problem 26 . To determine the mean ...
... Deviations . T HE Mean Vertical Deviation is the average ver- tical divergence and the Mean Horizontal the average horizontal divergence of an aggregate of shots from the calculated course of flight . Problem 26 . To determine the mean ...
Page 119
... deviation equals the square root of the sum of the squares of the mean vertical and mean horizontal deviations , and is expressed M. = √ ( M2 + M2 For . 41 The accuracy of the rifle is determined by the mean horizontal and mean vertical ...
... deviation equals the square root of the sum of the squares of the mean vertical and mean horizontal deviations , and is expressed M. = √ ( M2 + M2 For . 41 The accuracy of the rifle is determined by the mean horizontal and mean vertical ...
Page 130
Jesse Randolph Bevis, John Alexander Donovan. Problem 34 . To determine lateral deviation ... vertical notch in the revolving sleeve for a Lower the sight as far as ... vertical distance in inches , the post moved during one revolution of ...
Jesse Randolph Bevis, John Alexander Donovan. Problem 34 . To determine lateral deviation ... vertical notch in the revolving sleeve for a Lower the sight as far as ... vertical distance in inches , the post moved during one revolution of ...
Page 131
... deviation at 100 yards , etc. , for one complete turn of the elevating sleeve . Since an elevation of one minute ... vertical deviation of the bullet at the target for an elevation of 25 yards of the rear sight . Assume the target to be ...
... deviation at 100 yards , etc. , for one complete turn of the elevating sleeve . Since an elevation of one minute ... vertical deviation of the bullet at the target for an elevation of 25 yards of the rear sight . Assume the target to be ...
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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.