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A new inuention, and almost inuincible forme of fortifi∣cation, against the furious battery of Artillarie.
IT hath béene the common vse in all fortifications héeretofore, to place the earth behind the walles of the Fortresse, and therof to make Bulwarks and Ramparts, but in the construction of this inuincible fortresse, against the infernall furie of Artillarie, it is necessary to vse a new inuention to fo•…•…tefie. For the sayd earth be∣ing placed in forme of Rampart behindthe wall, cannot serue to resist the blowes of the Cannon, but then onely when the saide wall is ruinated: which is quite contrary to the proportion I meane to preferre. For in stéede that ye wall dooth couer the earth, and dooth serue for defence vnto the same, I meane to make the earth to supply thys Office, and that it doo not onely hinder the Artillary from béeing able to batter the same wall, but also that it become a couer thereunto, to the intent the sight thereof may bée wholly taken away from the Enemie.
To performe which, it is necessary to plant and place the earth before the wall, & not as of ordinary is accustomed, to ioyne it close to the wall, but distant thirtie or thirtie fiue foote, in ma∣king a dry Ditch without water betwixt them both.
Thys earth shall be sustained vpon that side, which doth behold the Fortresse, with a little wall of foure foote thicknes in the foun∣dation, arising to be two foote thicke in the height. Upon that side which dooth looke towards the fieldes, it shall likewise be sustained with a little wall of sixe foote height from the toppe of the water, which is in the great Ditch, and dooth seperate this masse of earth from the Counterscarpe.
The plaine of thys earth shall be in thicknesse where it is most narrowe, which towardes the corners of the Flankers and Curtines, or more or lesse large as the proportion requires. And the largest, which is at the Angles, as well of the Curtines as Bulwarks 150. foote thick, which dooth arise to be 25. fadome, and for the gard of the sholders he shall haue 60. foote mounting to ten fadome. In sum, that the sholders in comprehending all the space, which is from the walles yt the flanck makes, vnto the little wall, which dooth sustaine the masse of earth vppon the side of the great Ditch, shalbe 150. foote. That is to say, the earth shal haue in this