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A12531 The arte of gunnerie. Wherein is set foorth a number of seruiceable secrets, and practical conclusions, belonging to the art of gunnerie, by arithmeticke skill to be accomplished: both pretie, pleasant, and profitable for all such as are professors of the same facultie. / Compiled by Thomas Smith of Barwicke vpon Tweed souldier. Smith, Thomas, fl. 1600-1627. 1601 (1601) STC 22855; ESTC S116363 60,711 126

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other ⅖ partes being cut and taken away and so left open serues to turne the powder into the peece the which to do Gunner like as soone as you haue filled the ladle so full that you may strike the same with a rule and put the same into the mouth of the peece fixe your thombe vpon the vpper part of the staffe towards the ende next the tampion or head thereof and so thrusting the ladle gentlie home to the breech of the peece turne the rammer staffe so as your thombe fall directly vnder the staffe and so shall you empty your ladle orderly Now to know the ⅗ parts of the bullets circumference that you may make the plate of your ladle orderly and of that iust breadth lay the measure of the whole circumference to an inch rule and then multiplie the same by 3 and deuide the product by the denominator 5 your quotient will tell you truely the breadth that the plate of your ladle ought to be of Example A Cannon whose bullet is 7 inches high will be 22 inches in the circumference that multiplied by 3 is 66 which deuided by 5 the quotient is 13 inches ⅕ the true breadth that the plate for a cannon ladle of 7 inches diameter ought to be of The length of the ladle is to be made according to the length height and weight of the peece for which it is made which in a table in the ende of the booke you may find set downe for all sorts of peeces How to make a ladle for a chamber-bored peece Open your compasse the iust diameter of the chamber within ⅛ part of an inch thereof Deuide that measure 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 diameter thereof will be a iust quarter of an inch shorter then the diameter of the chamber-bore by the circumference whereof you may find out the true breadth of the plate of a ladle that is fit for such a chamber-bored Cannon 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 cannon 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 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 How to find out the height or diameter of the chamber in any chamber-bored Cannon or other peece of Ordinance and how to find out the thicknes of the mettall round about the chamber thereof Take your priming yron or else a straight peece of wyer and bow the end thereof in manner of a hooke and then put the same into the touch-hole downe to the lowest part of the concauity of the peece and then with your knife or else with a peece of chalke make a stroke vpon the wyer hard by the vpper part of the mettal without the peece at the touch-hole then measure by your inch rule how long the wyer is from that stroke to the end After put in the same wyer againe and pull it vp so as the bowed end may restor stay within the cilinder or concaue of the peece and make an other marke or stroke on the said wyer hard by the vpper part of the mettal the distance betweene those 2 strokes is the iust thicknes of the mettall round about the chamber the which abated from the length of the wyer I meane from the first stroke to the lowest end the remaine is the true diameter of the chamber-bore in that peece Example Admit the length of the wyer from the end of the concauity to the first stroke containeth 15 inches and the distance betweene the 2 strokes is 8 inches then those 8 inches is the iust thicknesse of the mettall about the chamber which abated from 15 inches restes 7 inches the iust diameter of the chamber in such a peece By Arithmeticke skill how to know whether the caryage for your peece be truly made or no or how the caryage for any other peece of Ordinance ought to be made Measure the iust length of the Cilinder or bore of your peece the plankes of your caryage ought to be once and a halfe that length Also measure the diameter of the peece and the sayd plankes at the fore end should be in deapth 4 times the diameter and in the midst 3 times and ½ the diameter and at the ende next the ground two times and ½ the diameter and in thicknesse once the diameter Example Admitte a Culuering of sixe inches diameter is in length in the bore thereof 20 times that measure that is 10 foote long then I say that the plankes of her caryage ought to be 15 foote in length and at the fore end next the peece 2 foote in breadth and in the midst one foote three quarters and at the lowest end next the ground one foote and a quarter and in thicknesse halfe a foote Also euery caryage ought to haue foure transomes and ought to be strengthened with strong yron boltes The holes or centers wherein the trunions ought to lye ought to be three times and ½ the diameter from the fore end of the caryage and in depth ⅔ parts of the thicknesse of the trunions which depth you may easily find out as thus take the height or diameter of the trunions and multiply the same measure by 2 and deuiding by the denominator 3 the quotient will shew your desire How by knowing the weight of any one peece of Ordinance to find out the weight of any other Question If a Saker of foure inches diameter weigh 1600 pound weight what will a Culuering weigh that is sixe inches diameter Resolution Some would thinke that the rule of proportion plainly wrought would answer this question but in that they are deceiued for the content of solide bodies being massie are Sphericall or Cubicall inproportion therefore you must multiply the diameters of euery peece cubically set downe the weight of the peece knowne in the middle number and so working according to the rule of proportion you shall find out the true weight of the greater peece Example 4 inches the diameter of the lesser peece multiplied cubically ariseth 64 inches Likewise the cubicke number of the diameter of a Culuering of 6 inches high is 216 inches then framing