Identifier: britishmarsconta00robs (find matches)
Title: 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
Year: 1763 (1760s)
Authors: Robson, Joseph
Subjects: Great Britain. Royal Navy Military art and science Naval art and science Fortification
Publisher: London : Printed for the author, and sold by W. Flexney
Contributing Library: University of Pittsburgh Library System
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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lt againft,whole Bottom is nearly upon a Line with the Fore-Part of the Foundation, and flopes 6, 8 or i o Inchesin every Foot in height, for any Number of Feet,fuppofe 6 or 8 Feet high •, and at that Height over-hangs, or goes upright, or ever lb irregular 3 or 4Feet, more or lefs in Height, and the Bottom of theRock at or above the Surface, flopes backward,downward, lb that no Hold can be got of the Rockfor a Foundation •, if it is only a Rock of eight or tenFeet broad or thereabouts, an Arch may be fprungfrom the Foundation, on each Side, to build the Wallupon before the Rock •, but if the Rock is large, theGround muil be dug from its Face, and a Founda-tion made, and if the Rock b;;low is almoft as farout as the Foundation on each Side, fo that there isnot a fafficient Breadth for a Foundation to keep(trait with the other Foundation; the Foundationbefore the Rock mull: be laid out farther than theother Foundation a fufficicnt Breadth, with broad Retreats ^j^ic^ Fa-iye /-f-O.
Text Appearing After Image:
( 140 ) do the Work well, making well faft every Height tothe Work above, with good hard flat Stones andOyiler-Shells, which is called pining among Work-men. There muft be good Bond made, elpeciallyfrom the back Side of the Wall to the Front: Everygood pradical Mafon knows how to do this Work toanfwer the End, as well as if the Wall had been car-ried up altogether. It is not difficult to build a Wall to (land firmagainft the Face of a Rock, if the Rock can be cutin the common Way, let the Face of it be ever fo ir-regular and flopeing; I could mention feveral Me-thods, but at prefent I will only explain one Method,which I will adapt to the moil difficult Cafe I canthink of, where the Rock can be eafily cut by thecommon Methods. Admit the Face of a Rock is to be built againft,whole Bottom is nearly upon a Line with the Fore-Part of the Foundation, and flopes 6, 8 or i o Inchesin every Foot in height, for any Number of Feet,fuppofe 6 or 8 Feet high -, and at that Height over-hangs, or go

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