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 91
the extremes, andthe ratio of the producl of the means to the other extreme, be in a ratio ofequality : And either mean, and the ratio of the producl of the extremes to theother mean, will be alfq in a ratio of equality. That is, If a : b : : c : a. Then 4 = B-2LC. And b =A-2LH. p c Dem. Since a :… … GEOMETRY. 248. THEOREM. XXV. In any plane triangle fAB c), any two adjoiningfides (ab, AC,) are tut proportionally by a line (de)drawn parallel to the other fide (bc), viz.ad : d b : : ae : £C. Dem. Thro b and c, draw b b c a at right an-, gles to b c, meeting b a drawn thro a parallel to bc:…
Navigation · Nautical astronomy · Fortification
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