How to make a ladle for a chamber-bored peece.
Open your compasse the iust diameter of the cham∣ber, within ⅛ part of an inch thereof. Deuide that mea∣sure in 2 equall partes, then set your compasse to one of those parts, and with the one foote fixed on a paper or smooth boord, draw with the other foote a circle, the dia∣meter thereof will be a iust quarter of an inch shorter then the diameter of the chamber-bore, by the circumfe∣rence whereof, you may find out the true breadth of the plate of a ladle that is fit for such a chamber-bored Can∣non, by the rule afore set downe how to find the true breadth of the plate of any ladle, for any other peece of Ordinance, in taking the ⅗ partes of the circumference thereof, the length ought to be twise the diameter, and ⅔ partes, to hold at 2 times the iust quantitie of corne powder that is due to charge such a chamber-bored can∣non with
Example.
The diameter of the circle drawne for any cannon whose chamber-bore is 7 inches containeth 6 inches ¾9 the circumference whereof is 21 inches 6/7, the ⅗ partes thereof is 12 inches ¾, and so much ought that ladle to Page 29 be in breadth, and in length it ought to be 18 inches ⅔. In this order you may worke to make a ladle in length and breadth for any bel-bored Cannon: and to find out the thicknes of the mettall at the touch-hole, or the height of the bore thereof, the conclusion following will shew you.
