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 107
eral divifions of thearc ad, will interfect the line dg ; and the diftances from d to the feveraldivifions of dg will be the lengths of the feveral tangents. 316. For the Secants. From the centre c, with radii to the divi-fions of the tangent dg, cut the line cf ; and the diftances from c to… … If TRIGONOMETRY. 27 317* If the figure was fo large that the quadrantal arc could contain everydegree and minute of the quadrant, or 5400 equal parts ; then the chord,Ifine, tangent and fecant to each of them could be drawn. Nowafcaleof equal parts being conftru&ed, 1000 of which parts are…
Navigation · Nautical astronomy · Fortification
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