Thursday, November 24, 2016

CRIMINALISTICS: Ballistics

Firearms Evolution:

Gun Powder
Invented in China in the 9th century CE.

First Firearm
Invented in China during the 13th century CE, after the Chinese invented black powder. 

Fire lances
The fire lance was invented in China during the 10th century and is the predecessor of all firearms.

Note:
The earliest fire lances were spear-like weapons combining a bamboo tube containing gunpowder and projectiles tied to a Chinese spear. Upon firing, the charge ejected a small projectile or poison dart along with the flame. These fire lances had a range of only a few feet. Being a weapon that combines with a spear, it was initially used as a hand-to-hand weapon with the gunpowder shot designed to give the wielder an edge in close-quarter combat

The first fire-lances were seen in China during the 10th century, but by about 1260 they had developed into a variety of forms and although normally associated with peasant rebels, regular Song troops also used them, their use by cavalry being described at the siege of Yangzhou in 1276.

Early Modern Age
During the early modern age, these hand-held cannons evolved into the flintlock rifle, then the breech loader and finally the  automatic weapon.
The Battle of Cerignola in 1503 was largely won by Spain through the use of matchlock firearms, marking the first time a major battle was won through the use of firearms.
Early firearms had to be cocked and caught by the "sear", which holds the hammer back, before each shot. Pulling the trigger allows the hammer or striker to fly forward, striking the "firing pin," which then strikes the "primer," igniting an impact-sensitive chemical compound (historically, first fulminate of mercury, then potassium chlorate, now lead styphnate) which shoots a flame through the "flash hole" into the cartridge's propellant chamber, igniting the propellant.
As ignition devices, matchlockswheellockssnaplockflintlocks and percussion caps were used in turn.
The paper cartridge was introduced in 1586, and the bayonet came to use in 17th century France. Hand grenades, thrown by grenadiers, appeared around the same time.


Early Handheld Cannons:

Matchlock
The matchlock was the first mechanism, or "lock," invented to facilitate the firing of a hand-held firearm. This design removed the need to lower by hand a lit match into the weapon's flash pan and made it possible to have both hands free to keep a firm grip on the weapon at the moment of firing, and, more importantly, to keep both eyes on the target.

Note:
The classic European matchlock gun held a burning slow match in a clamp at the end of a small curved lever known as the serpentine. Upon the pulling of a lever (or in later models a trigger) protruding from the bottom of the gun and connected to the serpentine, the clamp dropped down, lowering the smoldering match into the flash pan and igniting the priming powder. The flash from the primer travelled through the touch hole igniting the main charge of propellant in the gun barrel. On release of the lever or trigger, the spring-loaded serpentine would move in reverse to clear the pan. For obvious safety reasons the match would be removed before reloading of the gun. Both ends of the match were usually kept alight in case one end should be accidentally extinguished.


Earlier types had only an "S"-shaped serpentine pinned to the stock either behind or in front of the flash pan (the so-called "serpentine lock"), one end of which was manipulated to bring the match into the pan.



Matchlock Mechanism
Most matchlock mechanisms mounted the serpentine forward of the flash pan. The serpentine dipped backward, toward the firer, to ignite the priming. This is the reverse of the familiar forward-dipping hammer of the flintlock and later firearms.


A later addition to the gun was the rifled barrel. This made the gun much more accurate at longer distances but did have drawbacks, the main one being that it took much longer to reload because the bullet had to be pounded down into the barrel.


Snap matchlock
A type of matchlock was developed called the in which the serpentine was held in firing position by a weak spring, and released by pressing a button, pulling a trigger, or even pulling a short string passing into the mechanism. As the match was often extinguished after its relatively violent collision with the flash pan, this type fell out of favour with soldiers, but was often used in fine target weapons.


An inherent weakness of the matchlock was the necessity of keeping the match constantly lit. The match was steeped in potassium nitrate to keep the match lit for extended periods of time. Being the sole source of ignition for the powder, if the match was not lit when the gun needed to be fired, the mechanism was useless, and the weapon became little more than an expensive club. This was chiefly a problem in wet weather, when damp match cord was difficult to light and to keep burning. Another drawback was the burning match itself. At night, the match would glow in the darkness, possibly revealing the carrier's position. The distinctive smell of burning match-cord was also a giveaway of a musketeer's position.


Wheel Lock
wheellockwheel-lock or wheel lock, is a friction-wheel mechanism to cause a spark for firing a firearm. It was the next major development in firearms technology after the matchlock and the first self-igniting firearm. Its name is from its rotating steel wheel to provide ignition. Developed around 1500, it was used alongside the matchlock and was later superseded by the snaplock (1540s), the snaphance (1560s) and the flintlock (c. 1600).



The wheellock works by spinning a spring-loaded steel wheel against a piece of pyrite to generate intense sparks, which ignite gunpowder in a pan, which flashes through a small touchhole to ignite the main charge in the firearm's barrel. The pyrite is clamped in vise jaws on a spring-loaded arm (or 'dog'), which rests on the pan cover. When the trigger is pulled, the pan cover automatically opens, and the wheel spins as the pyrite is pressed into contact.


A close modern analogy of the wheellock mechanism is the operation of a modern cigarette lighter, which spins a toothed steel wheel against a sparking material to ignite the fuel into a flame. However, the wheellock is used to send the flame to then ignite the charge in the barrel.

A wheellock firearm can be instantly readied and fired even with one hand, in contrast to the then-common matchlock firearms, which must have a burning cord of slow-match ready if the gun might be needed and demand the operator's full attention and two hands to operate. The wheellock mechanism is complex to make, making it relatively costly.


Snaphance
snaphance or snaphaunce is a type of lock for firing a gun or is a gun using that mechanism. The name is Dutch in origin but the mechanism can not be attributed to the Netherlands with certainty. 

It is the mechanical progression of the wheellock firing mechanism, and along with the miquelet lock and doglock are predecessors of the flintlock mechanism. It fires from a flint struck against a striker plate above a steel pan to ignite the priming powder which fires the gun. Examples of this firearm can be found through Europe, North Africa, and the Middle East.


Like the earlier snaplock and later flintlock, the snaphance drives a flint onto a steel to create a shower of sparks to ignite the main charge (propellant).

The flint is held in a clamp at the end of a bent lever called the cock. Upon pulling the trigger, this moves forward under the pressure of a strong spring and strikes a curved plate of hardened steel (called simply the steel, or in 17th century English dialect the frizzen) to produce a shower of sparks (actually white-hot steel shavings). These fall into a flash pan holding priming powder. The flash from the pan travels through the touch hole to cause the main charge of gunpowder to explode. The steel is at the end of an arm that can be moved independently of the pan cover.

Note:

The snaphance first appeared in the late 1550s as an improvement of the earlier snaplock in one or more of the following countries: Spain, Holland, Germany, Scotland, or Sweden.



Flint lock
An old-fashioned type of gun fired by a spark from a flint. Flintlock is a general term for any firearm that uses a flint striking ignition mechanism. The term may also apply to a particular form of the mechanism itself, also known as the true flintlock, that was introduced in the early 17th century, and rapidly replaced earlier firearm-ignition technologies, such as the matchlock, the wheellock, and the earlier flintlock mechanisms.

Note:
The true flintlock continued to be in common use for over two centuries, replaced by percussion cap and, later, the cartridge-based systems in the early-to-mid 19th century. 

Although long superseded by modern firearms, flintlock weapons enjoy continuing popularity with black-powder shooting enthusiasts.


Flintlock Mechanism
The flintlock mechanism is a type of lock used on musketspistols, and rifles in the 17th, 18th, and 19th centuries. It is commonly referred to as a "flintlock" (without the word mechanism), though that term is also commonly used for the weapons themselves as a whole, and not just the lock mechanism.


The flintlock, also known as the true flintlock, was developed in France in the early 17th century. It quickly replaced earlier technologies, such as the matchlock and wheellock and the earlier flintlocks. It continued to be in common use for over two centuries, until it was finally replaced by the percussion lock.




Early Modern Firearm

Muzzleloading Firearm
muzzleloader is any firearm into which the projectile and usually the propellant charge is loaded from the muzzle of the gun (i.e., from the forward, open end of the gun's barrel). This is distinct from the more popular modern (higher tech and harder to make) designs of breech-loadingfirearms. The term "muzzleloader" applies to both rifled and smoothbore type muzzleloaders, and may also refer to the marksman who specializes in the shooting of such firearms. The firing methods, paraphernalia and mechanism further divide both categories as do caliber (from cannons to small-caliber palm guns).

Modern muzzleloading firearms range from reproductions of sidelock, flintlock and percussion long guns, to in-line rifles that use modern inventions such as a closed breech, sealed primer and fast rifling to allow for considerable accuracy at long ranges.

Note:
The percussion cap, introduced circa 1820, was the crucial invention that enabled muzzleloading firearms to fire reliably in any weather. This gave rise to the caplock or percussionlock system.

breech-loading gun is a firearm in which the cartridge or shell is inserted or loaded into a chamber integral to the rear portion of a barrel.



Modern mass production firearms are breech-loading (though mortars are generally muzzle-loaded). Early firearms, on the other hand, were almost entirely muzzle-loading. The main advantage of breech-loading is a reduction in reloading time—it is much quicker to load the projectile and the charge into the breech of a gun or cannon than to try to force them down a long tube, especially when the tube has spiral ridges from rifling. In field artillery, breech loading allows the crew to reload the gun without exposing themselves to enemy fire or repositioning the piece (as was required for muzzle-loaded guns) and allows turrets and emplacements to be smaller (since breech loaded guns do not need to be retracted for loading).








Essential Timeline re Firearm History:



1232 Gun Powder

The Chinese who invented gunpowder (black powder) first used it in a weapon - gunpowder filled tubes aka rockets.
  
1364 First recorded use of a firearm
 The shooter lit wicks by hand that ingnited gunpowder that was loaded into the gun barrel.

1400 Matchlock guns
The first mechanically firing of guns. Wicks were now attached to a clamp that sprang into gunpowder that was placed in a "flash pan".

  

1509 Wheel Lock

Wheel lock guns - wicks were replaced the wheel lock that generated a spark for igniting the gunpowder.

  

1630 Flint Lock
Flintlock guns - the flintlock did two things mechanically, it opened the lid of the flash pan and provided an igniting spark.

  

1825 Percussion System

Percussion-cap guns invented by Reverend John Forsyth - firing mechanism no longer uses flash pan, a tube lead straight into the gun barrel, the tupe had an exposive cap on it that exploded when struck

1830 Back action lock
The true date for a back action lock is difficult too date,they were around in the flintlock period most were fitted to  over and under and also revolving barrel pistols The back action lock has we know today is mostly associated to George Lovell patent of 1835-36.Lancaster had a back -action tube lock of 1826
  
1835 Colt Firearms
Colt revolver - first mass-produced, multi-shot, revolving firearms. Samuel Colt received a British patent on his improved design for a revolver in 1835.

Single Action Revolver
The revolver was chosen by the Army in 1872, with the first order, for 8000 revolvers, shipping in the summer of 1873: The Colt Single Action Army or "Peacemaker", also known as the Colt Model 1873, was born. This revolver was one of the most prevalent firearms in the American West during the end of the 19th century and Colt still produces it, in six different calibers, two finishes and three barrel lengths.  

Single actions derive their name from the fact that they can only be fired by cocking the hammer and squeezing the trigger one shot at a time, whereas the double action can be fired in the same manner as the single action or simply by squeezing the trigger to fire – hence “double action.”

All modern day single-action revolvers are based, however loosely, on the Colt Single Action Army (SAA). So timeless was the design that it is still in wide use today. There are a number of manufacturers of single-action revolvers, including Ruger, Freedom Arms, Magnum Research, Uberti and Colt.


Double Action Revolver
After the success of the Colt Single Action Army and Colt's conversion of existing percussion revolvers to Richards-Mason conversions, Mason went on to design Colt's first Double-action revolver, the Colt M1877. Following this, he once again teamed up with Richards to produce a larger-framed version, the Colt M1878 Frontier. It was Colt's first large-frame, double-action revolver. It combined the front end of the Single Action Army revolver with a double-action, 6-shot frame mechanism. It was available commercially in numerous calibers.

In the case of back-up work, a double-action revolver offers a couple of distinct advantages over its single-action counterpart, to include the ability to fire by simply pulling the trigger without pulling the hammer back, and the ability to open the cylinder and load and unload more easily compared to a single-action revolver where one round at a time can be loaded and unloaded.



1840 Pin-fire cartridges
pinfire cartridge is an obsolete type of metallic firearm cartridge in which the priming compound is ignited by striking a small pin which protrudes radially from just above the base of the cartridge. Invented by Frenchman Casimir Lefaucheux in the 1830s but not patented until 1835, it was one of the earliest practical designs of a metallic cartridge. Its history is closely associated with the development of the breechloader which replaced muzzle-loading weapons.

  
1850 
Shotguns
shotgun (also known as a scattergun and peppergunor historically as a fowling piece) is a firearm that is usually designed to be fired from the shoulder, which uses the energy of a fixed shell to fire a number of small spherical pellets called shot, or a solid projectile called a slug. Shotguns come in a wide variety of sizes, ranging from 5.5 mm (.22 inch) bore up to 5 cm (2.0 in) bore, and in a range of firearm operating mechanisms, including breech loading, single-barreled, double or combination gunpump-action, bolt-, and lever-action, semi-automatic, and even fully automatic variants.

A shotgun is generally a smoothbore firearm, which means that the inside of the barrel is not rifled. Preceding smoothbore firearms, such as the musket, were widely used by armies in the 18th century. The direct ancestor to the shotgun, the blunderbuss, was also used in a similar variety of roles from self-defense to riot control.

  
1859 
Rim-fire cartridge
Rimfire is a method of ignition for metallic firearm cartridges as well as the cartridges themselves. It is called rimfire because the firing pin of a gun strikes and crushes the base's rim to ignite the primer. This is in contrast to the more common centerfire method, where the firing pin strikes the primer cap at the center of the base of the cartridge. The rim of the rimfire cartridge is essentially an extended and widened percussion cap which contains the priming compound, while the cartridge case itself contains the propellant powder and the projectile (bullet). Once the rim of the cartridge has been struck and the bullet discharged, the cartridge cannot be reloaded, because the head has been deformed by the firing pin impact. While many other different cartridge priming methods have been tried since the 19th century, only rimfire technology and centerfire technology survive today in significant use.

Characteristics of a Rimfire Cartridge
Rimfire cartridges are limited to low pressures because they require a thin case so that the firing pin can crush the rim and ignite the primer. Rimfire cartridges of .44 caliber (actually .45 caliber) up to .56 caliber were once common when black powder was used as a propellant. However, modern rimfire cartridges use smokeless powder which generates much higher pressures and tend to be of .22 caliber (5.5 mm) or smaller. The low pressures necessitated by the rimfire design mean that rimfire firearms can be very light and inexpensive, which has helped lead to the continuing popularity of these small-caliber cartridges.
  

1860 Spencer repeating carbine patented
The Spencer repeating rifle was a manually operated lever-action, seven shot repeating rifle produced in the United States by three manufacturers between 1860 and 1869. Designed by Christopher Spencer, it was fed with cartridges from a tube magazine in the rifle's buttstock.
The Spencer repeating rifle was adopted by the Union Army, especially by the cavalry, during the American Civil War, but did not replace the standard issue muzzle-loading rifled muskets in use at the time. The Spencer carbine was a shorter and lighter version. 

 
1861 
Breech loaded guns
A rifled breech loader (RBL) is an artillery piece which, unlike the smooth-bore cannon and rifled muzzle loader (RML) which preceded it, has rifling in the barrel and is loaded from the breech at the rear of the gun. The spin imparted by the gun's rifling gives projectiles directional stability and increased range.

 
1862 
Gatling Gun
A hand-driven machine gun, the Gatling gun was the first firearm to solve the problems of loading, reliability, and the firing of sustained bursts. It was invented by Richard J. Gatling during the American Civil War, and later used in the Spanish-American War, but was supplanted by advanced weaponry soon after. Years later, the technology behind the gun was re-introduced by the U.S. military, and new versions of the gun are still in use today.  


1869 
Center-fire cartridge
centerfire cartridge is a cartridge with a primer located in the center of the cartridge case head. Unlike rimfire cartridges, the primer is a separate and replaceable component. Centerfire cartridges have supplanted the rimfire variety in all but the smallest cartridge sizes. With the exception of a few .17 caliber and .22 caliber pistol and rifle cartridges, small-bore shotgun cartridges (intended for pest-control), and a handful of antique, mostly obsolete cartridges, almost all pistol, rifle, and shotgun ammunition used today is centerfire.

An early form of centerfire ammunition, without a percussion cap, was invented between 1808 and 1812 by Jean Samuel Pauly.

This was also the first fully integrated cartridge. True centerfire ammunition was invented by the Frenchman Clement Pottet in 1829.However, Pottet would not perfect his design until 1855. The centerfire cartridge was improved by Benjamin Houllier, Charles Lancaster, George Morse, Francois Schneider, Hiram Berdan and Edward Mounier Boxer.


Types of Center-Fire Primers:
The identifying feature of centerfire ammunition is the primer which is a metal cup containing a primary explosive inserted into a recess in the center of the base of the cartridge. The firearm firing pin crushes this explosive between the cup and an anvil to produce hot gas and a shower of incandescent particles to ignite the powder charge.


Berdan Primer
Berdan primers are named after their American inventor, Hiram Berdan of New York who invented his first variation of the Berdan primer and patented it on March 20, 1866. A small copper cylinder formed the shell of the cartridge, and the primer cap was pressed into a recess in the outside of the closed end of the cartridge opposite the bullet. In the end of the cartridge beneath the primer cap was a small vent-hole, as well as a small teat-like projection or point (later to be known as an anvil) fashioned from the case, such that the firing pin could crush the primer against the anvil and ignite the propellant. This system worked well, allowing the option of installing a cap just before use of the propellant-loaded cartridge as well as permitting reloading the cartridge for reuse.


Boxer Primer

Colonel Edward Mounier Boxer, of the Royal Arsenal, Woolwich, England was working on a primer cap design for cartridges, patenting it in England on October 13, 1866, and subsequently received a U.S. patent for his design on June 29, 1869.

Boxer primers are similar to Berdan primers with one major difference: the location of the anvil. In a Boxer primer, the anvil is a separate stirrup piece that sits inverted in the primer cup providing sufficient resistance to the impact of the firing pin as it indents the cup and crushes the pressure-sensitive ignition compound. The primer pocket in the case head has a single flash-hole in its center. This positioning makes little or no difference to the performance of the round, but it makes fired primers vastly easier to remove for re-loading, as a single, centered rod pushed through the flash hole from the open end of the case will eject the two-piece primer from the primer cup. A new primer, anvil included, is then pressed into the case using a reloading press or hand-tool. Boxer priming is universal for US-manufactured civilian factory ammunition.


1871 Cartridge 
cartridge is a type of ammunition packaging a bullet or shot, a propellant substance (usually either smokeless powder or black powder) and a primer within a metallic, paper, or plastic case that is precisely made to fit within the firing chamber of a firearm.

The primer is a small charge of an impact-sensitive or electric-sensitive chemical mixture that can be located at the center of the case head (centerfire ammunition), inside a rim (rimfire ammunition), or in a projection such as in a pinfire or teat-fire cartridge. Military and commercial producers continue to pursue the goal of caseless ammunition. A cartridge without a bullet is called a blank. One that is completely inert (contains no active primer and no propellant) is called a dummy.


Note:

Paper cartridges have been in use for nearly as long as hand-held firearms, with a number of sources dating their use back to the late 14th century.

  
1873 Winchester rifle

Winchester rifle is a comprehensive term describing a series of lever-action repeating rifles manufactured by the Winchester Repeating Arms Company. Developed from the 1860 Henry rifle, Winchester rifles were among the earliest repeaters. The Model 1873 was particularly successful, being colloquially known as "The Gun that Won the West".