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
168. PROBL ETM XVII. Between two given right lines a, b, to find d, a mean proportional. Operation, ift. Draw a right line, in whichtake ac=zA, abz=.B. 2d. Bifect be in f j and on f, with the radius rb3defcribe a circle bee. 3d. From a draw ae perpendicular to be; then aeis the mean proportional…
Navigation · Nautical astronomy · Fortification
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