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 80
perpendicular to the bafe, and hi feels the ver-tical angle: and the contrary. Dem. The triangles adc, bde, are congruous,Since ca=cb (114); cd = cd, and ad = db by fuppofkion :Therefore Z. a —£. b, Z. acd = bcd, Z. adc =Z. bdc. (191) Confequently cd is at right angles to ab. (108) 194. Corol.… … 12 195. 6c GEOMET R,Y:
Navigation · Nautical astronomy · Fortification
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