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 100
ow thefection figh is a circle (285). Therefore fo x OG=:oT (254).Again. The triangles goe, fod, are fimilar. For Z_GEO = z.DFo=:Z_ABcby conftr. And Z.coe = Z. dof. (183)Therefore eo : og :: Fo : Do (250). And eoxdo=fo xog (255) =oizSo that 01 is a mean proportional, either between fo & og, or… … Sd GEGMETRt, S;E C T I O N VI.OF THE VPIR A L. 287. Suppoje the radius of a circle to revolve with an uniform motion roundits centre, and while it is revolving, a point is moving along the radius}then will the fuccejfive places of that point he in a curve ivhich is called afpiral. This will be…
Navigation · Nautical astronomy · Fortification
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