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 74
points b, c, d, a, &c. draw lines acrofs the threeparallels a, b, c; then are the fpaces or diftances Ab, be, cd, &c. calledthe primary divifions. 4th. Diyide the left hand fpace into 10 equal parts (171), and thro*thefe points let lines parallel to d e be drawn acrofs the parallels bc;and… … _4: t£ a Such fcales are ufeful for conflructing of figures whofe fides are exprefledin meafures of length; as feet, yards, miles, &c. Or to find the mea-fures of the lengths of lines in a given figure. Thus a line of 36, or of 360, feet, yards, £f?c is taken, by fettingone point of the…
Navigation · Nautical astronomy · Fortification
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