THere are Three Degrees used in Fortifying each sort of Ordnance, both Cannons and Culverings.

First, Such as are ordinarily Fortified are called Legitimate Pieces.

Secondly, Such whose Fortification is lessened, are therefore called Bastard Pieces.

Thirdly, Those that are Extraordinary Pieces, are called Double Fortified.

The Fortification is reckoned by the thickness of the Metal at the Touch-hole, at the Trunnions, and at the Muzzle, in proportion to the Diameter of the Bore.

The Cannons double Fortified, have full one Diameter of the Bore, in thickness of Metal at the Touch-hole, and 11/16 at the Trunnions, and in their Muzzle 7/16.

The Lessened Cannons have at their Touch-hole ¾ or 12/16 of the Diameter of their Bore, in thickness of Metal, and 9/16 at the Trunnions, and 5/16 at the Muzzle.

The Ordinary Fortified Cannons have 7/8 at the Touch-hole, 5/8 at the Trunnions, and 3/8 at the Muzzle.

All the Double Fortified Culverings, and all Lesser Pieces of that kind, have 1 Diameter, and 1/8 at the Touch-hole, 15/16 at the Trunnions, and 9/16 at the Muzzle.

The Ordinary Fortified Culverings are fortified every way as your Double Fortified Cannons ; and the Lessened Culverings as the Ordinary Cannons in all points.