A light to the art of gunnery wherein is laid down the true weight of powder, both for proof and action, of all sorts of great ordnance : also the true ball and allowance for wind, with the most necessary conclusions for the practice of gunnery, either in sea or land-service : likewise the ingredients and making of most necessary fire-works, as also many compositions for the gunner's practice, both at sea and land / by Capt. Thomas Binning ...

CHAP. XXII. To find the Diameter and Length of the Taper'd Chamber of a Peece.

* 1.1PRovide a Tamken to the Bore or Height of the Ball; put it on the end of an Half-Pike, and put it up till it stop at the Chamber or top; take that out again, having before mar∣ked the Half Pike; then put up the Half-Pike in the Gun to the Breech, and mark the Half-Pike again; then take a Peece of bowed Wire, and put it in at the Touch-hole to the lower part of the Chamber, and mark the Wire above the Gun; then hale it up till it hack at the upper part of the Chamber, and mark the Wire there again; so measuring betwixt these two Marks of the Wire, you have the small end of the Taper-bore; then measuring the Diameter of the Tamken, and so you have the great End: Then taking the Distance between the marks of the Half-Pike, so having both Diameters and Length, (if you will) you may draw the form of a Taper'd Chamber on Paper, and extract the Wind from it, for the Cartrage go∣ing up with more ease.

Notes

• * 1.1

  Most ne∣cessary.