The muzzle, properly so called, is the part from the muzzle astragal to the end of the piece.
Small divisions exterior.
The cascable, the hindermost part of the breech, from the base-ring to the end of the button.
The cascable-astragal, is the diminishing part between the two breech mouldings.
The neck of the cascable, is the narrow space between the breech moulding and the button.
The breech, is the solid piece of metal behind, between the vent and the extremity of the base-ring, and which terminates the hind part of the gun, exclusive of the cascable.
The breech-mouldings, are the eminent parts, as squares or rounds, which serve only for ornaments to the piece, &c.
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.