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 118
c.Let A r=radius of the tables: then m (parallel to BH)=fine of — L. a. (298)Then the triangles a » r, akb, apc, are fimilar.And a r : rn :: ab : bk j alfo a r : r n : : a c : (cp=) BO.Therefore aTx :7«* : : ac x AB : (bk x bo=) bm x bnt. (244, 255)Or (fq. rad.=) r* : fq. fine £ Z. A : : ac x ab :… … 9S TRIGONOMETRY. Or Log. s, 4 ■£, a -.kog. { c+H-Log. | ~-Log. E-Log.r.. Or L. ,U Ar-1 E + L F + L * s+°+L io -, 9 f 86 (85
Navigation · Nautical astronomy · Fortification
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