Naval Ordnance: A Text-book Prepared for the Use of the Midshipmen of the United States Naval Academy

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Roland Irvin Curtin, Thomas Lee Johnson
United States naval institute, 1915 - Gunnery - 383 pages

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Page 32 - ... inch, no cast-iron gun, however thick, could bear a charge which would strain it beyond that point ; for, on the first round the interior layer would be ruptured before the outer portion could come into play, and every succeeding round would tend to make matters worse.
Page 30 - A cannon may be considered as a tube destined to withstand a given pressure from within, throwing a projectile which shall produce certain effects at given distances. In constructing such a tube we must first consider what pressures it will have to withstand at the various points of its length, and then make it strong enough to insure perfect safety. Not only must the gun be sufficiently strong, but it must not be too heavy; so it is important that the material shall be arranged in such a manner...
Page 19 - These powers resist any deflection of the shell's longitudinal axis and prevent the shell from "tumbling." If it were not thus given gyroscopic properties, with great power to resist deflecting influences, inaccuracies would result. A built-up gun is a term applied to all guns made up of different parts, the idea being to get an assemblage of parts best able to resist the pressures of the powder gas. The gun may be built up of different metals. The most usual forms are: (1) the built-up gun with...
Page 292 - When an uncapped projectile strikes the extremely hard face of a modern armor plate, the whole energy of the projectile is applied at the point, and the high resistance of the face of the plate puts upon the very small area at the point of the projectile a stress greater than the metal can resist, however highly tempered it may be. The point is therefore broken or crushed and the head of the projectile flattened, Fig.
Page 245 - ... present, the question of density and hardness. A particle of spherical or cubical form will expose less surface to ignition in proportion to its volume than one of an elongated or flat shape, and will consequently require a longer period for the combustion of its entire mass ; the larger the particle, also, the longer will be the time required for its combustion. Looking, then, at one grain of powder by itself, we may say that the larger it is, and the more nearly its form approaches a sphere,...
Page 245 - ... ignited, it will first be inflamed over its whole surface, and the progressive combustion will take place from the exterior to the interior. Its rate of combustion will therefore depend upon both its shape and size, leaving out entirely, for the present, the question of density and hardness. A grain of spherical or cubical form will expose less surface to ignition in proportion to its volume than one of an elongated or flat shape, and will consequently require a longer period for the combustion...
Page 306 - The flame now passes out through vent g and burns along the upper time train in an anticlockwise direction until the vent j is reached, where it passes down to the beginning of the lower time train and burns back in a clockwise direction to the position of the vent o, whence it is transmitted by the pellet of compressed powder m to the powder magazine p.
Page 306 - The thoroughly pulverized ingredients are mixed dry, and alcohol is added to dissolve the shellac. The percussion pellets are formed by pressing the mixture while in a plastic state into the percussionprimer recess. Upon the evaporation of the alcohol the shellac causes the pellet to adhere to the metal of the recess.
Page 3 - Malleability is the property of being permanently extended in all directions without rupture by pressure (as in rolling) or by impact (as in hammering). It is opposed to brittleness, which is the tendency to break more or less readily under compression either gradual or sudden.
Page 2 - This lasting part of the strain is called a set, and in such cases the strain is not proportional to the stress. 4. Under a still greater stress, the strain rapidly increases, and the body is finally ruptured or broken. 5. A force acting suddenly, as a shock, causes greater...

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