Rifled cannon

“ Rifled cannon have now, however, become a certainty. Mechanically speaking, they are as easily to be produced as hand rifles. The general application has, however, vast difficulties, which must be overcome before their use can become general. Small arm projectiles suitable for rifles must of necessity be made of ductile metal, and all the attempts previously made, whether with brass or iron guns, are alike useless. ”

“ When these arms reached such a degree of excellence that horses and gunners could be shot down at a distance of one thousand yards, the old-fashioned smooth-bore artillery was deprived of its prestige. To retrieve this disadvantage and restore the superiority of artillery over musketry in length of range, methods of rifling cannon for field service became an important study. For assailing distant lines of troops, for opening a battle, for dispersing bodies of cavalry, for shelling intrenchments, for firing over troops from hills in their rear, rifled guns are of invaluable service. ”

“ Rifled cannon certainly present problems far more complicated than the small-arm. They can by no means be considered, as yet, so near perfection. It is boldly maintained by many experts, both here and in England, that the "smashing" power at point-blank range of such smooth-bores as the Rodman 12-inch and 15-inch is greater than that of the rifle of the same weight. ”

“ The late Joseph Manton has the merit of being the first modern inventor of rifled cannon. His idea was, that if a motion on an axis parallel to the horizon could be given to cannon balls, they would range farther and with greater accuracy. As there exists great difficulty in causing the rifling in a gun to act upon an iron ball, he constructed a cup of wood, into which the ball was fitted, projections being made upon the wood to fit into the groves of the rifle; the spinning motion thus being communicated to the ball by its wooden adjunct. ”

“ The shape of the bore would otherwise be rapidly altered by the action of the projectile. This quality is particularly necessary in rifled cannon. The term strength as applied to cannon metal is not confined to tensile strength alone, but embraces also elasticity, ductility, and crystalline structure, which affect its power to resist the enormous and oft-repeated force of gunpowder. (See Ordnance, Strains upon.) Each discharge of a cannon, however small, impairs its strength, and repeated a sufficient number of times, will burst it ”

“ The introduction of rifled cannon into practical use, about twenty years ago, caused a complete revolution in the art of gun-making. Cast iron and bronze were found no longer suitable for the purpose. Cast iron was too brittle to sustain the pressure of the powder gas, when its duration was increased by the use of elongated projectiles ”

“ Trunnions and all impinging influences are incompatible with correctness of fire. The muzzle must be raised in a similar manner to the raising of a hand rifle, the recoil being thrown backwards, in as direct a line as possible with that of the shot.
It is only on account of the difficulty of experimenting with rifled cannon that they are at all behind rifled muskets in point of perfection. The ardent lover of science is appalled when an experiment costs hundreds of pounds. We have not a General Jacob everywhere who can afford to spend a thousand or two in experiments ”

“ Trunnions act as the fulcrum of a scale-beam; they allow the breech and muzzle of the gun to oscillate, but in an opposite direction to a scale beam. Rifled cannon can never be correctly constructed whilst any weight impinges on the gun in front of the first starting point of the projectile; they must have the fulcrum behind the point of discharge, and the more nearly in a direct line the better.
Rifled cannon will in some few years be perfectly constructed of cast steel; the projectile being made of gun metal, i. ”

“ A short time will suffice to make the disparity between our artillery and small arms as great as when we were content with the six-pounder field gun and old “Brown Bess.” Ranges will only be ruled by sight, and objects will be hit eventually with as much ease at 5,000 yards as they now are at 1,000. Steel, rifled cannon, and projectiles of gun-metal will assuredly bring about as complete a revolution in artillery as the Greenerian rifle and bullet have effected in small arms. ”

“ The mass in motion, even when of equal hardness with the gun (as in the case of cast iron guns and cast iron shot) , invariably [121] destroys that in a comparative state of rest; and the rifling is obliterated after a very few discharges. In a brass gun the destruction is certainly not so rapid, on account of the different nature of the metal; yet the destruction of the gun for all useful purposes is equally effectual. It is evident, then, that success cannot be obtained by using the present materials in rifled cannon ”

“ The civil war served as an incentive to the Americans to rifle all their large calibre guns as quickly as possible. In ’62 large numbers of cast-iron cannon were rifled and reinforced by external hoops of iron. The results were deplorable. A great number of pieces burst; and experience made it clear that “a gun made up of a single homogeneous casting soon reaches a limit of resistance to internal pressure beyond which the addition of extra metal has little or no effect.” ”

“ The development of the rifle from the old smooth-bore musket, by cutting grooves or channels in the form of a screw in the interior surface, was found so advantageous in increase of precision of aim and length of range, that the rifling of cannon in time followed and is now universally used. Breech loading has also replaced muzzle loading, another vast advantage in the use of artillery. A form of breech-loading cannon was introduced in the sixteenth century, but the advantageous use of this device is of late invention. ”

“ After reaching Harper's Ferry two more six-pound brass pieces were received for this battery from Richmond. As there were no caissons for these four guns, farm-wagons were used, into which boxes of ammunition, together with chests containing rations for the men, were loaded. In addition to friction-primers of modern invention at that time for firing cannon, the old-time "slow matches" and "port-fires" were in stock. ”

“ We did manage to hit some, though with what effect we could not tell."
"Then the German gun is still a mystery," observed Tom.
"It is. But we shall discover it soon. We will never rest until we do!"
So more and new and different theories continued to be put forth regarding the big cannon, if such it was. Ordnance experts wrote articles, alike in London, Paris, and New York, explaining that it was possible for a cannon to be within the German lines and still send a shell into the French capital. But few believed that it was feasible. ”

“ His view of the field was blurred, for a while, by the smoke from so much firing, which floated in thickening clouds over all the open spaces and the edges of the forest. It produced curious optical illusions. The French loomed through it, increased fourfold in numbers, every individual man magnified in size. He saw them lurid and gigantic, pulling the triggers of their rifles or muskets, or working the batteries. The cannon also grew from twelve-pounders or eighteen-pounders into guns three or four times as large, and many stood where none had stood before. ”

“ Cannon appear to have been first used in sieges as mortars, to destroy hoardings by throwing round stones and barrels of burning composition. Early in the 15th century we find cannon throwing metal balls, not only against hoarding and battlements, but also to breach the bases of the walls. It was only possible to work the guns very slowly, and archers or crossbowmen were needed in support of them, to drive the defenders from the crenellations or loopholes of the battlements. At that period the artillery was used in place of the medieval siege engines and in much the same manner. ”

“ The range of these giant cannon is enormous and their destructive power great, this being added to by the fact that the explosive shell has replaced the solid round shot of old-time gunnery. A 14-inch gun of 45 caliber can discharge a 1,400-pound projectile at a muzzle velocity of 2,600 feet per second. If we compare this with a locomotive going at the speed of sixty miles an hour, we have in the latter a speed of eighty-eight feet per second to compare with the 2,600 feet per second of the cannon ball. ”

“ Rifles were already crackling in the valleys between, where the pickets were seeking the lives of one another, and now came the deep, rumbling thunder of the giant cannon as they threw their shells from a range of eight or ten miles. When a shell burst there was a crash like that of a volcano in eruption, great cavities were torn in the earth, and men fell in dozens. Vast clouds of smoke from the monster guns began to drift against the horizon, but nearer where the smaller guns were at work only light white clouds appeared.
The advancing German army was a semicircle of fire. ”

“ As time went on, cannon, though primitively formed as described, increased in size that prodigious balls might be expelled from them against walled places, in imitation of the ancient machine which they had superseded; thus they soon became of enormous bore, until they attained the dignity of bombardes, like Mons Meg in Edinburgh Castle; but the difficulty of managing these pieces, and the growing knowledge that iron shot of much less weight could be impelled further by the use of better powder, gradually introduced the cast metal cannon used at the present day. ”

“ The method is a very old one revived, but with such scientific modifications as to have enormously increased the effectiveness of small-arms; with cannon its successful practical application to the larger natures has not yet been arrived at, but with field-guns it has added largely to accuracy of practice and facility of loading.
BREECH OF A CANNON. The after-end, next the vent or touch-hole. It is the most massive part of a gun; strictly speaking, it is all the solid metal behind the bottom of the bore. Also, the outside angle formed by the knee-timber, the inside of which is the throat. ”

“ The greater efficiency of the iron ball, together with an improvement in gunpowder, further encouraged the building of smaller and stronger guns. Before 1500 the siege gun had been the predominant piece. Now forged-iron cannon for field, garrison, and naval service—and later, cast-iron pieces—were steadily developed along with cast-bronze guns, some of which were beautifully ornamented with Renaissance workmanship. The casting of trunnions on the gun made elevation and transportation easier, and the cumbrous beds of the early days gave way to crude artillery carriages with trails and wheels. ”

“ H.M.S. DREADNOUGHT FIRING A BROADSIDE OF 12-INCH GUNS
But look inside this massive gun-hood, from which protrude forty feet of two sleek grey monster cannon, each of which is capable of hurling 850 pounds of steel and high explosive a distance of a dozen miles. Grouped round their guns in various attitudes are the bluejackets forming their crews. They are tanned and weather-beaten fellows, but there is a strained and tired look about their eyes. Here in the confined spaces of their turret they have eaten, slept, and whiled away the watches as best they might for many, many hours. ”

“ Such [pg 60] a colloquy in our day would need to be carried on with forty-horse power speaking-trumpets, or with the thunderous articulation of that between the bellowing Alps and echoing Jura. Even smooth-bore field-pieces, with point-blank of three hundred and twenty yards and service range of one thousand, have to keep their distance. It is a rare thing now for cannon to be captured by a charge of cavalry or the bayonet. The rifle destroys quantum suff. of their horses, and, their support overpowered, they remain a helpless prey. ”

“ The only engineer who has, by practical experience, satisfied himself that large masses of wrought iron are totally useless for making heavy ordnance is Mr. Nasmyth; whose monster cannon, which was to astonish the whole world, proved, when heated, to have so little cohesion that it would scarcely hold together whilst being lifted from the furnace to the anvil. ”

“ In a close conflict so unwieldy a weapon as the telescope-rifle is of course useless, and its owner must depend upon his side-arms for defence. The same is true of artillery, and, as we said before, these riflemen are to be considered and used in service as light artillery,—requiring a sufficient support to enable them to withdraw from close action, but operating with deadly effect upon individual enemies at a distance at which cannon are serviceable only against masses, and, for the most part, require a series of trials to get the range, which may be constantly shifting. ”

“ Artillery, now in the general acceptance of the term, includes all and every description of gun, of greater power and dimensions than muskets and other shoulder guns.
Modern civilization, with its giant strides of improvement, has rejected the cumbrous and unsightly complication of springs, levers and wheels; and given to us, in their stead, the light and handsome six-pounder cannon; which is so easy of transit that it can accomplish the most complex and difficult movements, while the horses are at their fullest gallop. ”