_The base-ring and ogee_, are ornamental mouldings; the latter is always in the shape of an S, taken from civil architecture, and used in guns, mortars, and howitzers. _The vent-field_, is the part from the vent to the first re-inforce astragal. _The vent-astragal and fillets_, are the mouldings and fillets at or near the vent. _The charging cylinder_, is all the space from the chace-astragal to the muzzle-astragal. _The first re-inforce ring and ogee_, is the ornament on the second re-inforce. _The first re-inforce astragal_, is the ornament between the first and second reinforce. _The chace-girdle_, is the ornament close to the trunnions. _The trunnions_, are two solid cylindrical pieces of metal on every gun, which project from the piece, and by which it is supported upon its carriage as an axis. _The dolphins_, are the two handles, placed on the second re-inforce ring of brass guns, resembling the fish of that name: they serve for mounting and dismounting the guns. _The second re-inforce ring and ogee_, are the two ornaments joining the trunnions. _The second re-inforce astragal_, is the moulding nearest the trunnions. _The chase-astragal and fillets_, the two last-mentioned ornaments jointly. _The muzzle-astragal and fillets_, the joint ornaments nearest the muzzle. _The muzzle-mouldings_, the ornaments at the very muzzle of the piece. _The swelling of the muzzle_, the projected part behind the muzzle-mouldings. _Interior Parts._ _The mouth, or entrance of the bore_, is that part where both powder and ball are put in, or the hollow part which receives the charge. _The vent_, in all kinds of fire-arms, is commonly called the touch-hole; it is a small hole pierced at the end, or near it, of the bore or chamber, to prime the piece with powder, or to introduce the tube, in order, when lighted, to set fire to the charge. _The chamber_, which is only in large calibers, is the place where the powder is lodged, which forms the charge. _Tools for loading and firing_ CANNON, are rammers, sponges, ladles, worms, hand-spikes, wedges, and screws. _Coins_, or _Wedges_, to lay under the breech of the gun, in order to elevate or depress it. _Hand-spikes_, serve to move and to lay the gun. _Ladles_, serve to load the gun with loose powder. _Rammers_, are cylinders of wood, whose diameter and _axis_ are equal to those of the shot: they serve to ram home the wads put upon the powder and shot. _Sponge_, is fixed at the opposite end of the rammer, covered with lamb skin, and serves to clean the gun when fired. _Screws_, are used to field-pieces, instead of coins, by which the gun is kept to the same elevation. _Tools necessary for proving_ CANNON, are, a searcher with a reliever, and a searcher with one point. _Searcher_, is an iron, hollow at one end to receive a wooden handle, and on the other end has from four to eight flat springs of about eight or ten inches long, pointed and turned outwards at the ends.