Pistol
PISTOL, a small fire-arm designed for quick work and personal protection at close quarters, and for use in one hand. It was originally made as a single and also double-barrelled smooth bore muzzle-loader, involving no departure in principle from the History. Pistols are understood to have been made for the first time at Pistoia in Italy, whence they receive their name. Caminelleo Vitelli, who flourished in 1540, is the accredited inventor. The first pistols, in the 16th century, had short single barrels and heavy butts, nearly at right angles to the barrel. Shortly afterwards the pattern changed, the butts being lengthened out almost in a line with the barrels. These early pistols 1 were usually fitted with the wheel-lock (see GUN). Short, heavy pistols, called " daggs," were in common use about the middle of the 17th century, with butts of ivory, bone, hard wood or metal. A chiselled Italian dagg of 1650, for example, had a slightly bell-nosed barrel of about 8 in. in length and 14 bore. The German wheel-lock military pistols used by the Reiters, and those made for nobles and gentlemen, were profusely and beautifully ornamented. Pistols with metal hafts were common in the 16th and 17th centuries, many beautiful specimens of which, silver-mounted, were made in Edinburgh and used by Highlanders. Duelling, when in vogue, caused the production of specially accurate and well-made single-barrelled pistols, reliable at twenty paces. The pattern of this pistol seldom varied, its accuracy at short range equalling that of more modern ones, the principle of a heavy bullet and light charge of powder being employed. The first doublebarrelled pistols were very bulky weapons made with the barrels laid alongside one another, necessitating two locks and two hammers. There was also the "over and under" pistol, one barrel being laid over the other. This was a more portable weapon, only requiring one lock and hammer, the second barrel being turned round by hand, after the first had been fired, or, as an alternative, the flash-hole being adjusted to the second barrel by a key. These pistols were first made with flint and steel locks and subsequently for percussion caps. Double " over and under " pistols were also made with a trigger mechanism that served to discharge both barrels in turn.
Revolvers. A revolver is a single-barrelled pistol with a revolving breech containing several chambers for the cartridges, thus enabling successive shots to be rapidly fired from the same weapon without reloading. The ordinary pistol is now, and has been for many years past, superseded by the revolver. The first revolver, fired with the percussion cap, was made with the whole of the barrels, six, seven or eight, revolving in one piece, and was known as the " pepper-box." It was " single action," i.e. the hammer was raised and the barrels revolved by the pull of the trigger. This weapon was cumbrous and no accurate aim could be taken with it owing chiefly to the strength and resistance of the main-spring and the consequent strong pull required on the trigger. The principle of a revolving breech to one barrel, which superseded the " pepper-box," is an old one in the history of fire-arms, dating from the 16th century. At to INS.
FIG. I. Dagg (Royal United Service Institution).
ordinary fire-arms of the day. With the introduction of revolvers and breech-loading pistols and the application of " rifling " to musket barrels, came also, in the early half of the 19th century, the rifling of pistol-barrels.
first the breech cylinder was revolved by hand, as in the revolving arquebus or matchlock, a specimen of which is now in the 1 For the use of long heavy pistols by cavalry in the ifith and 17th centuries, see ARMY: History; and CAVALRY.
Tower of London, but this was subsequently improved by introducing geared mechanism, by which the pull of the trigger or the cocking of the hammer, or both, do the work. There exists a pistol of the time of Charles I. which is rotated automatically as the hammer is raised.
rapidly fired, if necessary, by the trigger action alone. Many revolvers on the Colt principle were in use during the Crimean War and the Indian Mutiny, and proved of valuable service to British officers.
As rim-fire, pin-fire and central-fire cartridges were succes- FIG. 2. Wheel-lock pistol (Royal United Service Institution).
In 1814 a self-acting revolver mechanism of a crude pattern was produced in England. Four years later Collier used a separate spring to rotate the chamber. In 1835, an American, Samuel Colt, produced and patented the first practical revolving pistol, the idea of which was obtained by him, it is stated, from an ancient " revolving " weapon in the Tower of London. The chambers of the first Colt revolver were loaded with powder and bullets from the muzzle end, and each chamber had a nipple that required to be capped. It was the invention of the copper cap that made the Colt revolver possible. Under the old sively introduced, breech-loading revolvers were constructed to use them. Messrs Smith & Wesson, of Springfield. U.S.A., produced the first metal cartridges for revolvers. Pin-fire cartridges, paper and metallic, were used on the continent of Europe for Lefaucheux and other revolvers, and these and rimfire cartridges are still used for revolvers of small calibre. But since the central-fire cartridge has proved its superiority for guns, its principle has been generally applied to pistol cartridges, at first to the larger bores.
The alteration of the muzzle-loading to the breech-loading 1zz 0 INCHES FIG. 3. Wheel-lock pistol (Royal United Service Institution).
priming system with, exposed powder in a pan the difficulty of separate and effective ignition with the revolving cylinder was almost insuperable.
The first American revolver makers caused the cocking of the hammer to revolve the cylinder, while the English makers effected this by the pull of the trigger. In 1855, Adams of London, and also Tranter of Birmingham, brought out the double-action revolver, in which the revolution of the cylinder could be effected by both these methods. When the revolver is cocked and fired by pressing the trigger, greater rapidity of chamber in the revolver involved no decided change of type. The original Colt, as a breech-loader, remained practically the same weapon as before, with a changed chamber. A hinged flap uncovered the breech-chamber on the right, and as each chamber reached that point the empty cartridge case was ejected by means of an ejecting-rod carried in a tube attached to the under side of the barrel and kept in place by a spiral spring, and the chamber reloaded. The next improvement was greater ease and rapidity of extraction, obtained first by Thomas's invention of making the barrel and chamber slide FIG. 4. Flint-lock pistol (Royal United Service Institution).
10 INS fire is obtained than when the hammer is cocked with the thumb, but accuracy is impaired, as the trigger requires a long pull and considerable force in order to compress the mainspring and revolve the cylinder. The double action revolver was, therefore, a great advance on the single action, enabling the first and also following shots, if desired, to be accurately fired by a moderate pressure of the trigger after the hammer had been cocked by the thumb; or, alternatively, the revolver could be forward on the frame of the pistol. The extractor, being fast to the pivot, retained the cartridges until the chamber was pushed clear of them. Then the chamber was made to swing on one side, as in the Colt pistol illustrated, enabling all the cartridges to be simultaneously extracted. Finally, self-extracting revolvers with jointed frames were introduced, in which the dropping of the barrel forces out the extractor as in an ordinary double gun, the extractor acting simultaneously in all the chambers of the pistol. A spring returns the extractor to its place when the empty, cartridge cases have been ejected, and brings the barrel to an angle of about 45, for convenience in loading. The soundness and rigidity of the weapon depend upon the efficiency of the connexion between the barrels and the standing breech, and a top snap bolt has proved the strongest and handiest with the pistol, as with the shot-gun.
This type of revolver originated with Messrs Smith & Wesson, but they and other gunmakers have greatly improved upon the original model. Between the American pattern and the English, as made by Messrs F. Webley & Son, the chief difference is that in. the Smith & Wesson the holding-down bolt or catch is upon the barrel, and it engages with the top of hammer and trigger when the latch is pushed to the rear for opening the cylinder, and does not unlock them until the cylinder is positively closed and is locked by the latch. The cylinder revolves and is supported on a central arbour of the crane (E). The crane fits in a recess in the frame below the barrel and turns on its pivot arm (A). The ejector rod with its spring passes through the centre of the cylinder arbour and is terminated in rear by the ejector with a ratchet (y). Pushing against the front end of the ejector rod will empty the chambers, the cylinder being swung out for loading. The thumb-piece of the latch (j) slides to the rear in the left side of the frame, unlocking the cylinder for opening, but upon closing the cylinder, the body of the latch firmly enters a recess in the ejector, locking the cylinder in position for firing.
One great disadvantage of revolvers is the escape of gas at the opening between the breech of the barrel and the cylinder.
}IH3 FIG. 6. Pepper-box revolver.
FIG. 5. Percussion-lock pistol (Royal United Service Institution).
the standing breech; whereas in the Webley the bolt is upon the standing breech and grips the extremity of the hinged barrel. Neither mechanism is as strong as could be wished if heavy charges of smokeless nitro-compounds are to be used. This hinged type of revolver is most convenient for use on horseback, as the pistol can be opened, the cartridges extracted and the weapon reloaded with one hand.
The Coil's Double-action Revolver, calibre -38, model 1896, used in the United States army, consists (figs. 7 and 8) of the barrel (B), the cylinder (C) with six chambers, the frame (F), and the firing mechanism, all of steel. The muzzle velocity, with a charge of 16 grains of black powder and a bullet of 150 grains of lead, is about 708 ft. per second, giving at 25 yards a penetration of about jj in. in pine.
The lock mechanism consists of the hammer (h), with its stirrup (r), stirrup pin (p), strut (s), strut pin (i), strut spring (g); the trigger (/); the rebound lever (/); the hand (a), with the spring (z); the cylinder bolt (6), with its spring (x); the locking lever (t>) ; the main spring (m), and rebound lever spring (n). The hammer (h), trigger (/), and rebound lever (/) are pivoted on their respective pins, which are fastened in the left side of the frame. The lower end of the rebound lever spring (n) is secured to the frame and the free end bears under the rear end of the rebound lever so that the latter, when the trigger is released, cams the hammer back to its safety position, and forces the trigger forward. Pressure upon the trigger causes its upper edge to engage the strut, and thereby raises the hammer until nearly in the full-cock position, when the strut will escape from the trigger, and the hammer, under the action of the main-spring, will fall and strike the cartridge. A projection on the upper part of the trigger, working in a slot in the frame, prevents the cylinder from making more than one-sixth of a revolution at a time by entering one of the grooves nearest the rear end of the surface of the cylinder. When the cylinder is swung out of the frame, the parts are arranged to prevent the cocking of the hammer. The cylinder bolt is pivoted on the trigger pin, and its spring, bearing on the rebound lever arm, causes the nose of the bolt to project through a slot in the frame ready to enter one of the rectangular cuts in the cylinder surface. During the first movement of the trigger in cocking the revolver, the nose of the bolt is withdrawn, allowing free rotation of the cylinder. The object of the bolt is to prevent rotation of the cylinder in transportation. The hand is attached by its pivot to the trigger, and, as the latter swings on its pin when the hammer is being cocked, the hand is raised and revolves the cylinder, and also serves to lock the cylinder in position at the time of firing. An abutment on the side plate supports the hand spring in rear. The spring ensures the engagement of the hand with the ratchet (y). The revolver is cocked by hand by withdrawing the hammer by the pressure of corner hammer, the thumb until its full-cock notch engages in the rear sharp of the trigger. Pulling the trigger then releases the ha _, allowing its firing pin (/) to move forward and strike the cartridge.
_ The locking lever is pivoted by its screw in a recess in the left side of the frame, and so connected with the latch that it locks the This escape corrodes the surrounding parts and also materially diminishes the pressure in the barrel and the consequent velocity of the bullet. In the Nagant revolver, adopted by Russia, this disadvantage has been overcome by employing a long cartridge case which extends beyond the nose of the bullet and bridges the gap between barrel and cylinder as the cylinder is moved forward. A " mitrailleuse " pistol has also been constructed by the Braendlin Armoury Co., Ltd., on the " pepper-box " principle, with fixed barrels, either four or six, arranged in pairs, and a special striking mechanism, in which there is no revolving chamber and no escape of gas at the breech. It gives stronger shooting than a revolver, but is more cumbrous, and has the serious defect that the shock of the discharge of one barrel sometimes prematurely fires a second barrel. In 1865, Sharp, an American, patented an invention to remedy the escape of gas, in which the four barrels of the pistol FIGS. 7 and 8. Colt double-action revolver.
were drilled the full length out of one block of metal. The barrels were slid forward by an under lever to load, and the firing was effected by a revolving head to the hammer, set by the action of cocking the pistol.
About 1878 Messrs Lancaster introduced both two- and fourbarrelled hammerless pistols, in which an internal hammer was worked by the pull of the trigger. In all the three weapons above mentioned, extraction and reloading were slow processes, which made them unsuited for use on horseback.
Hammerless Revolver. The Smith & Wesso.i pocket pistol is one of the safest weapons of the size made. There is no and fires a charge of if drams of powder without unpleasant recoil. The duelling pistol, as made by Gartinne Renette of Paris, is capable of wonderfully accurate shooting, firing a 9 millimetre spherical bullet and about 12 grs. of powder. This hammer or equivalent protuberance to catch as the pistol is drawn from the pocket ; or to entangle if the weapon falls. An automatic safety bolt, whose length lies half across the palm of the hand, and ensures certainty of freedom at the time of shooting, blocks the action until the pistol is firmly gripped for use.
Breech-loading Pistols. Although the revolver has for many years practically superseded the pistol, some breech-loading FiG. 9. Mauser pistol (Text-book of Small Arms, by permission of the Controller of H. M. Stationery Office).
varieties of pistols are still made the small pocket pistol, for example, and occasionally the heavy double-barrelled horse pistol. At one time these latter were much used, of -577 bore, as well as the well-known short, large-bore pistol known as the Derringer, usually of -41 calibre. The double horse pistol is now usually made for a 2O-bore cartridge and spherical bullet, and weighs about 35 Ib. It is a clumsy, but effective weapon, weapon is far superior in accuracy to a revolver. Single-barrelled pistols, chambered for the -22 or 297/230 calibre cartridges, with a barrel of from 6 to 10 in. in length, are also made, and when fitted with a detachable metal stock form excellent little weapons for target practice.
Automatic Revolver. The Webley-Fosbery automatic revolver is a weapon of a distinctly new design, in which for the first time the principle of utilizing the recoil of each shot to operate the mechanism is applied to the revolver. In appearance the weapon is very similar to the Webley service model. The simple pressure of the forefinger on the trigger, the pressure being released between each shot, is all that is required to fire the six successive shots of the revolver. It is supplied with a safety bolt worked by a thumb-piece, and Messrs Webley have introduced a clip loader which enables the six chambers to be reloaded at the same time. This weapon has met with considerable success, and is made in two calibres, the -455, 6 shot, 2 Ib 55 oz. in weight; and the -38 model, 8 shot, 2 Ib 3 oz. in weight.
Automatic Pistols. These weapons are the latest and most advanced type of pistol, and it is anticipated by experts that they will ultimately supersede the revolver. They are made with one barrel and a magazine, on the principle of the repeating rifle, thus doing away with the escape of gas that takes place in revolvers between the chamber and the barrel.
Automatic pistols are so constructed that the force of the recoil is utilized to open the breech, extract the empty case, cock the pistol, reload the chamber with the top cartridge from the magazine, and close the breech, leaving the pistol ready to fire on again pressing the trigger.
The Mauser " self-loading " pistol (fig. 9) is one of the earliest of the successful automatic weapons. It is usually -300 calibre, 10 shot, with a metal clip loader from which the cartridges are " stripped " into the magazine, weight 2j Ib, length of barrel 5 \ in.; bullet 85 grains, initial velocity about 1394 f.s.
The barrel (i) and bod- (2) are in one piece; the latter contains the bolt (3). The barrel and body slide on the frame (4) ; the lo-shot magazine (5) and the stock are in one piece with the frame, and the lock frame (6) and lock-work are contained in the rear part of it. The bolt (3), which is square, slides in the body, and is kept pressed up to the chamber by the bolt spring (8) ; the rear end of this bolt spring bears against the block (9). The striker and extractor are contained in the bolt. The bolt is locked by the bolt-lock (10). This is slotted through the centre and fits on to the projection (n) under the body; it is supported at the moment of firing by a projection on the lock frame (12); the top of the bolt-lock has two teeth (13), which in the loaded and cocked position fit into two recesses in the bolt, and the bottom of its front end [in front of the body attachment (n)] has another tooth (14) which Bears on the rocker (15). This rocker is pivoted at its bottom corner. The main-spring (16) bears in front against the rocker, and in rear against the hammer mechanism. The action of the mechanism is as follows: on pressing the trigger, the trigger nose lifts the lever (18) which is attached to the scar (19), the lifting of the sear allows the main-spring to act backwards on the hammer, which impinges on the striker and fires the cartridge. At this moment the bolt is locked by the two upper teeth (13) of the bolt-lock, which is itself held up by the lock frame projection (13). But, the barrel body and bolt recoiling together ft of an in., the rear end of the bolt-lock (10) is no longer supported, the rocker (15) acting on the forward tooth (14) pulls down the bolt-lock and its upper teeth, the nose of the bolt-lock falling into the recess just behind the projection (12). Thus the barrel and body come to a standstill and the remaining recoil energy is used in driving back the bolt (now free) and extracting the cartridge case. When this energy is used up the bolt spring (8) reasserts itself, drives the bolt forward and pushes another cartridge into the chamber as in the magazine rifle, and the main-spring, acting on the rocker, pulls up the boltlock again and engages the teeth (13) in the bolt, locking it for FIG. 10. Colt automaticpistol.
the next shot. The releasing of the trigger brings the sear .(19) to its former position, cocking the pistol.
This pistol is usually supplied with a wooden holster which can also be attached to the grip of the pistol and so form a shoulder-stock for long-range shooting. It is sighted from 50 to 1000 yards.
The Colt Automatic Pistol, calibre -38 (fig. 10) consists of four main parts, namely the frame (F), the barrel (B), the slide (S), and the magazine (M). The frame forms, at its rear and lower part, the handle (A), which is hollow, and contains the seat for the magazine. After being charged with seven cartridges, the magazine is seated from below and held in place by the magazine catch (n) which slightly projects from the bottom of the handle. This projection serves to release the magazine from the catch, when it can be readily drawn from the handle for re-charging. In front of the handle is the trigger guard (g), in which the trigger (0 is found, and in the rear and above the grip the firing mechanism is placed in the part of the frame called the receiver (R). The firing mechanism consists of the hammer (h), the sear (w), the trigger (/), safety device (a), the main-spring (z) and sear spring (e), the lower part of the latter serving to operate the magazine catch. The top of the receiver extends forward from the handle, and to it the barrel is attached by two short links, one (/) near the front end of the barrel, and the other (o) at its rear end; these links are pivoted to the receiver and also to the barrel, and allow the barrel to swing rearwards thereon. As both links are of the same length, the rearward movement of the barrel in swinging on these links carries the barrel slightly downwards, but keeps its longitudinal axis in parallel positions during all its movements. Below the barrel the receiver forms a tubular seat for the retractor spring (r), which in front is closed by a plug (K) fastened in the receiver by the lower pivot-pin (f) of the front barrel-link. The upper surface of the receiver and two longitudinal grooves on its sides form the seat for the slide, which is guided thereon in its rearward and forward movements. The rear part of the slide forms the bolt or breech block (K), and the front part forms a partly tubular cover (s) which encloses the barrel. In the forward part of the receiver is a transverse mortice extending through the retractor spring seat, and transverse recesses in the forward part of the slide serve to admit a key (m) which, passing througn the sides of the slide and through the mortice, serves to lock the slide to the frame. The retractor spring (r), in its seat in the frame, consists of a spiral spring, the rear end of which rests against the receiver, and the front end of which carries a piston (p). The rear face of the key (m) has a slight recess, and when the key is in its place the front end of the retractor spring rests in this recess, thereby confining the key laterally. The tension of the retractor spring is exerted to force the key and the slide to their forward position. Upon the barrel are provided three transverse ribs (6), and in the interior of the slide are three corresponding recesses. These serve to lock the barrel and the slide firmly together when in their forward position. Between the locking recesses and the bolt, the slide has an opening on its right side for the ejection of the cartridge cases (J), and the bolt is provided with an extractor, a firing pin (/), a firing pin retraction spring (q), and a firing pin lock (y). This latter is pivoted at the rear end in the top of the slide, and when depressed, locks the firing pin in its retracted position, thus preventing its point from coming m contact with the cartridge primer. When raised, the firing pin lock releases the firing pin, and in this position also serves as the rear sight, being provided on the top with a sighting notch.
The operation of the pistol is as follows: When a charged magazine (M) is inserted, the slide (S) is drawn once to the rear by hand, thereby cocking the hammer (h). In this position of the slide, the carrier (c) and carrier spring in the magazine raise the topmost cartridge so as to bring it into the path of the bolt (K). On releasing the slide, it, with the bolt, is carried forward by the retractor spring (r), and during this movement the bolt forces the topmost cartridge into the barrel (B). As the slide approaches its forward position the front of the bolt encounters the rear end of the barrel and forces the latter to its forward position. During this forward movement the barrel swings forward and upward on the jinks (/, o), and thus the locking ribs (6) on the barrel are carried into the corresponding locking recesses in the slide. The barrel and slide are thereby interlocked, and the pistol ready for firing.
A slight pull on the trigger (t) now serves to move the sear (w) so as to release the hammer (h) and fire a shot. The force of the powder gases driving the bullet from the barrel is exerted rearwardly against the bolt, and, overcoming the inertia of the slide and the tension of the retractor spring, causes the slide and the barrel to recoil together. After moving rearwards together, for a distance, enough to ensure the bullet having passed from the barrel, the downward swinging movement of the barrel releases the latter from the slide and stops the barrel in its rearmost position. The momentum of the slide causes the latter to continue its rearward movement, thereby again cocking the hammer and compressing the retractor spring, until, as the slide arrives at its rearmost position, the empty shell is ejected from the side of the pistol and another cartridge raised in front of the bolt. During the return or forward movement of the slide, caused by the retractor spring, the cartridge is driven into the barrel, and the slide and barrel are interlocked, thus making the pistol ready for another shst. These operations may be continued so long as there are cartridges in the magazine, each discharge requiring only the slight pull on the trigger. The pistol is provided with a safety device (a) which makes it impossible to release the hammer unless the slide and barrel are in their first forward position and interlocked.
In the Borchardt-Leuger pistol (fig. 1 1 ) the bolt is solidly supported FIG. u. Borchardt-Leuger (Text-book of Small Arms, by permission of the Controller of H. M. Stationery Office).
at the moment of firing by a toggle joint. The barrel (i A) and body (l B) slide in the frame (l C), the bolt (2) slides in the body and is held up to the breech by the toggle joint 3 and 4 and the pins 5 and 7, which secure the links of the toggle to the body. The centre of pin (6) is below those of the other pins so that the joint cannot bend at the moment of firing. On the rear link (4) there is a swivel (9) which is connected to the recoil spring (10) in the grip. This pistol is fired by a spring striker, like a rifle, instead of by a hammer. The striker is within the bolt ; it is cocked in the recoil position by a claw on the end of the front link (3 A) and held thus when ready to fire by the nose of the trigger sear, these engaging with a projection (8 A) on the side of the striker. The magazine (8 shot) is in the grip. The action is as follows: the first cartridge is loaded from the magazine by pulling back the toggle joint. As soon as the toggle joint is released the recoil spring acts and forces the bolt home, with the cartridge in front of it. On pressing the trigger the barrel and body recoil a little. Then the toggle joint comes against curved ramps on the sides of the non-recoiling frame and is forced up, so that thereafter the bolt alone recoils (the ejector is similar in principle to that of a rifle). The recoil spring then acts' as before on reloading.
Other varieties of the automatic pistol are the " Mannlicher," the " Mars," the " Bergmann " and the " Webley." The last, being simple in construction, small and light, weight 18 oz. and length over all only 6J in., may be classed as a pocket pistol.
Qualities of Automatic Pistols. In reference to the general qualities of automatic pistols, while these weapons have the advantage over revolvers of longer range and greater rapidity of fire and recharging, on the other hand they are necessarily more complicated in their mechanism, which has to do the work of extraction, reloading and cocking that in the revolver is done by hand. A stoppage may occur through a cartridge missing fire, or continuous uncontrolled fire may take place through the trigger spring breaking until the magazine is exhausted. Their action is also to some extent uncertain, as it depends on the recoil of the discharge, which may be affected by variables in the cartridge; also the effective automatic working of the moving parts depends upon their cleanliness and lubrication. As automatic pistols, like revolvers, are intended for personal defence at short range and for sudden use in emergencies, simplicity of mechanism and certainty of action are in their case of paramount importance. There is usually no time to rectify a stoppage or jam, however slight. From a military point of view, therefore, before the revolver is altogether superseded by the automatic pistol, it is most desirable that the latter should be as certain in its action under service conditions as the former. Some automatic pistols, as already stated, are sighted up to 1000 yards, and provided with attachable butts. The practical value of these improvements is open to question, as the sighting of a pistol differs materially when used with and without a butt, and under no circumstances can the accuracy of shooting of a pistol, even with a butt, equal that of a carbine.
The tendency in automatic pistols has been to reduce the bore to 3 in., and increase the muzzle velocity, on the lines of modern small-bore rifles. These, again, would appear to be advantages of minor importance in a weapon intended for use at short range in the field, where a heavy bullet of fairly large diameter, with a moderate muzzle velocity, has a more immediate and paralysing effect, and is therefore, from this point of view, and particularly in savage warfare, preferable to a small projectile of high muzzle velocity. (H. S.-K.)
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)
