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 . EXPLANATION. Plate [To face Page 40.] A. Rolling Parapets fixd on
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 . EXPLANATION. Plate [To face Page 40.] A. Rolling Parapets fixd on Shore for a Battery of 4 Cannon. B. Men rolling Parapets afliore to enlarge the Battery already made, or to make other Batteries further on the Land. C. Floating Batteries, or rolling Parapets, which may be taken afunder and placed on the Land, as A, B. or otherwifci D. Flat-Bottomd Veflels to proted: the Landing, E. Stores upon Floats of rolling Parapets, F. Boats full of Men to be landed in the Face of the Enemy. EXPLANATION. Plate [To face Page 40.] A. Rolling Parapets fixd on Shore for a Battery of 4 Cannon. B. Men rolling Parapets afhore to enlarge the Battery already made, or to make other Batteries further on the Land. C. Floating Batteries, or rolling Parapets, which may be taken afunder and placed on the Land, as A, B. or otherwifci D. Flat-Bottomd Veflels to proted the Landing, E. Stores upon Floats of rolling Parapets, F. Boats full of Men to be landed in the Face of the Enemy,. [41 ] Thicknefs into the outfide of the binding Strokes ;and there muft be as many of thefe Eye-Bolt as willbe thought fufficient to bear the Weight the Shipwill Iwim at -, to each of thefe Eye-Boks fix threeftrong Chains of different Lengths, in Proportionto the Depth of the bhip, and to the Thicknefs ofthe Stratums of Materials that are to be put in tofwim her by ; after which hang thefe Chains per-pendicularly up, and flop them tight fafl -, then clearthe Hold, take out the f umps, an
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