IT is convenient that the Bullet be somewhat less than the Bore of the Gun ; that it may have vent in the Discharge, and not stick and break the Piece.

Now some think one Quarter of an Inch less than the Bore, will serve for all Guns, but this vent is too little for a Cannon, and too much for a Falcon.

It is more Rational and Artificial to divide the Bore of the Gun into Twenty equal parts, and let the Diameter of the Bullet be Nineteen of those parts, according to which Proportion the table aforegoing, in page 137 is Calculated.

THe matter of which Cartridges are made, are either Canvas or Paper Royal, either of which being prepared, take the height of the Bore of the Piece, and let the piece of Cloth or Paper be Three times the Diameter of the Bore or Chamber of the Piece for the Breadth, and for the length according as your Piece is ; (that is to say,) for the Cannon the length of the Cartridge must be Three Diameters, in the length for Culverins, Saker, Falcons, &c. Four Diameters, leaving at the top or bottom one Diameter more for the bottom of the Cartridge, cutting each side somewhat larger for the sewing and glewing them together, having a due respect for the augmenting or diminishing of your Powder, according to the goodness or badness thereof, and to the extraordinary over-heating of your Piece, and according to what you are to have your Cartridges made, you must have a Former of Wood turned to the height of the Shot, and a convenient length longer than the Cartridge; before you paste or glew your Paper on the former, first tallow it, so will the Canvass or Paper slip off without starting or tearing ; if you make Cartridges for Taper-bored Guns, your former must be accordingly tapered; if you make your Cartridges of Canvass, allow one Inch for the Seams, but of Paper 3/4 of an Inch, more than your 3 Diameters for pasting; when your Cartridges are upon the former, having a bottom ready fitted, you must past the bottom close and hard round about, then let them be well dryed, and mark every one with black or red Lead, or Ink, how high they ought to be filled : And, if you have no Scales or Weights, these Diameters of bullets make a reasonable Charge; for the Cannon two and a quarter, for the Culvering 3, and for the Saker 3 and a half, for the lesser Pieces 3 and a quarter of the Diameter of the Bullet, and let some want of their weight against the time they are over-hot, or else you endanger your self and others.