The Modern Rifle ...The Authors, 1917 - Ballistics |
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Page 36
... error in computation or in plotting has been made . y is more readily calculated when the angle of departure is known for the intermediate distances and the given range . q . v . chapter XV , problem 27 . y = x ( angle a - angle a ...
... error in computation or in plotting has been made . y is more readily calculated when the angle of departure is known for the intermediate distances and the given range . q . v . chapter XV , problem 27 . y = x ( angle a - angle a ...
Page 40
... errors of construction do not enter the formula . Or more broadly speaking , by experi- ment the value of C is determined irrespective of the shape or construction of the head of the pro- jectile . Briefly , the method is to set two ...
... errors of construction do not enter the formula . Or more broadly speaking , by experi- ment the value of C is determined irrespective of the shape or construction of the head of the pro- jectile . Briefly , the method is to set two ...
Page 47
... error in the value of C , and thus the ballistic properties of the projectile misrepresented . Fortunately , the ... errors due to the construction of the projectile and its steadiness and obliquity in flight , for the projectile does ...
... error in the value of C , and thus the ballistic properties of the projectile misrepresented . Fortunately , the ... errors due to the construction of the projectile and its steadiness and obliquity in flight , for the projectile does ...
Page 48
Jesse Randolph Bevis, John Alexander Donovan. The errors in the construction of projectiles are usually in the weight , the diameter or the point or in all . These errors varying to an indeterminable degree , k is invariably found by ...
Jesse Randolph Bevis, John Alexander Donovan. The errors in the construction of projectiles are usually in the weight , the diameter or the point or in all . These errors varying to an indeterminable degree , k is invariably found by ...
Page 61
... errors due to the variations in structure , in cutting , etc. , may be eliminated , the muzzle veloc- ity is usually determined experimentally , and is the average of many firings . The time element is the basis in experimentation and ...
... errors due to the variations in structure , in cutting , etc. , may be eliminated , the muzzle veloc- ity is usually determined experimentally , and is the average of many firings . The time element is the basis in experimentation and ...
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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.