A BRASS GUN.
NAMES OF THE SEVERAL PARTS OF A GUN.
AB Length of the Gun
AC First Reinforce
CD Second Reinforce
DE Chase
EB Muzzle
FA Cascable
GH Bore
RH Axis of the Piece
I Trunnions
L Vent Field
N Vent
O Swell of the Muzzle
VAK Breech
S Button
ab Button Astragal
cd Neck
ef Neck Fillet
g Breech Ogee
h Base Ring
i Base Ring Ogee
k Vent Field Astragal & Fillets
l First Reinforce Ring
m Second Reinforce Ring & Ogee
n Muzzle Astragal & Fillets
o Muzzle Mouldings
s Shoulder of the Trunnion
tu Diameter of the Bore or Calibre
When a Shot has been fired from a gun one second of time, it has fallen 16-1/12 feet; in two seconds, 64⅓ feet; in three seconds, 144¾ feet; and proportionally for every additional second.[4] For this reason, it is necessary to give a certain degree of elevation to a gun: as, for instance, should the time of flight of a shot be two seconds, the gun must be pointed 64⅓ feet above the object intended to be struck, because in that time it will have fallen through that space; therefore, the more distant the object is, the greater must be the elevation given to enable the shot to reach it.
There are three modes of extending the range of a Shot without increasing the charge of powder, viz.:—
1st. By raising the piece to a higher level.
2nd. By giving its axis greater elevation.