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GUN

military technology
The first small arms 
Small arms did not exist as a distinct class of gunpowder weapon until the middle of the
15th century. Until then, hand cannon differed from their larger relatives only in size.
They looked much the same, consisting of a barrel fastened to a simple wooden stock that
was braced beneath the gunner's arm. A second person was required to fire the weapon.
About the middle of the 15th century, a series of connected developments established
small arms as an important and distinct category of weaponry. The first of these was the
development of slow match--or match, as it was commonly called. This was cord or twine
soaked in a solution of potassium nitrate and dried. When lit, match smoldered at the end
in a slow, controlled manner. Slow match found immediate acceptance among artillerists
and remained a standard part of the gunner's kit for the next four centuries.
The matchlock 
Small arms appeared during the period 1460-80 with the development of mechanisms that
applied match to hand-portable weapons. German gunsmiths apparently led the way. The
first step was a simple S-shaped trigger, called a serpentine, fastened to the side of a
hand cannon's stock. The serpentine was pivoted in the middle and had a set of adjustable
jaws, or dogs, on the upper end that held the smoldering end of a length of match.
Pulling up on the bottom of the serpentine brought the tip of the match down into contact
with powder in the flashpan, a small, saucer-shaped depression surrounding the touchhole
atop the barrel. This arrangement made it possible for one gunner to aim and fire, and it
was quickly improved on. The first and most basic change was the migration of the
touchhole to the right side of the barrel, where it was served by a flashpan equipped
with a hinged or pivoting cover that protected the priming powder from wind, rain, and
rough handling. The serpentine was replaced by a mechanism, enclosed within the gunstock,
that consisted of a trigger, an arm holding the match with its adjustable jaws at the
end, a sear connecting trigger and arm, and a mechanical linkage opening the flashpan
cover as the match descended. These constituted the matchlock, and they made possible
modern small arms.
One final refinement was a spring that drove the arm holding the match downward into the
pan when released by the sear. This mechanism, called the snap matchlock, was the
forerunner of the flintlock. The fabrication of these devices fell to locksmiths, the
only sizable body of craftsmen accustomed to constructing metal mechanisms with the
necessary ruggedness and precision. They gave to the firing mechanism the enduring name
lock.
The development of mechanical locks was accompanied by the evolution of gunstocks with
proper grips and an enlarged butt to transmit the recoil to the user's body. The result
was the matchlock harquebus, the dominant military small arm of the 15th century and the
direct ancestor of the modern musket. The harquebus was at first butted to the
breastbone, but, as the power of firearms increased, the advantages of absorbing the
recoil on the shoulder came to be appreciated. The matchlock harquebus changed very
little in its essentials until it was replaced by the flintlock musket in the final years
of the 17th century.
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