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 104
a right one, or 45 degrees. Therefore that fpiral which cuts its rays ca, ch, &c. at angles of 45degrees, has a kind of logarithms belonging to it, fo related to theircorrefponding numbers, that the fmalleft variation between the firft andfecond numbers, is equal to the logarithm of the fecond… … THE ELEMENTS O F NAVIGATION. OF BPLANE O O K III. TRIGONOME TRY. SECTION I. Definitions and Principles. 296. T)LANE TRIGONOMETRY is an art whichJL fhews how to find the meafures of the fides and angles of planeTriangles, fome of them being already known. It will be proper for the learner, before he…
Navigation · Nautical astronomy · Fortification
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