The elements of navigation : containing the theory and practice, with all the necessary tables, to which is added, a treatise of marine fortification ... (1754)
Robertson, J. (John), 1712-1776, Adams, Charles Francis, 1807-1886, former owner. BRL, Adams, John, 1735-1826, former owner. BRL, Boston Public Library) John Adams Library BRL · London : Printed for J. Nourse ... · leaf 73
b into a propofed number of equal parti(Suppofe j). Operation, ift. From the ends a, b, withthe fame radius, defcribe the arcs c, d ; and fromA and b lines drawn to touch thefe arcs, as A E,B F, will be parallel. (155). 2d. In each of the lines ae, b f, beginning atA and b, take of any length, as… … x •.,S,( Anuthcr Method. Operation, ift. Thro one end a, draw a lin<5C c nearly perpendicular to A B. 2d. Draw E f parallel to ab, at any convenientdiftance. 3d. In e f take of any length, as many equalparts as ab is to be divided into \ as 1, 2, 3, 4, 5,6, to f. p 00■ 4th, Thro b, and f where…
Navigation · Nautical astronomy · Fortification
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