The British Mars : containing several schemes and inventions, to be practiced by land or sea against the enemies of Great-Britain ; shewing more plainly, the great advantage Britain has over other nations, by being masters at sea ; to which is added, an appendix, containing a scheme for manning the British navy, with less grievance to the subject; and a scheme to employ seamen ; of a copper mine near Hudson's Bay and of discovering the North-West passage, or determine there is no such passage ; with cautions and directions . tions to defend it when the Town is taken, norcover more Ground than
The British Mars : containing several schemes and inventions, to be practiced by land or sea against the enemies of Great-Britain ; shewing more plainly, the great advantage Britain has over other nations, by being masters at sea ; to which is added, an appendix, containing a scheme for manning the British navy, with less grievance to the subject; and a scheme to employ seamen ; of a copper mine near Hudson's Bay and of discovering the North-West passage, or determine there is no such passage ; with cautions and directions . tions to defend it when the Town is taken, norcover more Ground than is necelTary to fupport theSuperftrudureJ, if in a wet Situation, and yet bedefenceable to hold out a confiderable Time afterthe Town is taken, as the new Method of fortifyingcontained in the next two Chapters will Ihow 5 feeFig. 10. Plate Y\l\. C H A P. III. Explanation of Fig. i. Plate YlhA new Method to fortify a Re-entering Angle. A A The Ditch at the Foot of the The Hoping Heigth of the Body of the Place. CD f This Battery will much annoy the Befiegers in their Ap-proaches, and ruin their Batteries till they get near the Bodyof the Place, and are covered by the Works of the Town. X If the Situation is dry, the Bottom of this Battery, beingof a fmall Extent, may be well fecured with Mines, and hol-low Piles, at a little Expence; and the Bottom being verythick of fblid Mafonry, with a great Thicknefs of Earth roundit, will require a very confiderable Time to make a fufficientBreach with Cannon. (96) anrioy the Befiegers •, while at fome confiderableDiftance beyond the Works ; the excefliveHeight of this Battery, with Guns the Enemycannot difmount, (till they have battered awaythe folid Mafonry below the Metal Top, fo as tothrow it down •, but this will both require muchTime, and coll the Enemy f dear, if the Battery isbuilt as it Ihould be,) will be a great Annoyance tothe Befiegers Batteries, and will well defend aBreach on any Side of the Town ; th
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