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 102
f the divifions A d, de, ef-,fg-, &c. of thecircumference were very fmalJ, then would the fe-veral radii be fo clofe to one another, that the in-tercepted parts ad, de, ef, fg, e?Y. of the fpiralmight be taken as right lines. ^ci^fl And the triangles cad, cde, cef, &c. would be fimilar,… … 292. THEOREM XXXVII. If the radii of any proportional fpiral be taken as numbers, then will thecorrefponding arcs, of the circle, reckoned from their co?nmencement, be as tkslogarithms of thofe numbers. Dem. As the lines ca, cd, ce, cf, cg, &c. are a feries of terms in.geometric progreflion;…
Navigation · Nautical astronomy · Fortification
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