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 85
c ah, is greater than any right lined acute angle. For a right line ab muft be drawn from A, between the tangent AEand radius ad, to make an acute angle. But no fuch right line can be drawn between ae and the arc ah. 218. Corol. II. Hence the angle eah, between the tangent ea andarc ah, is lefs… … 220. THEOREM XX. If two right lines (ab, cd) interfecl any how (ir,e) within a circle ; their inclination (aed, or ceb]is meafured by half the fum of the intercepted arcs(ad, cb). Dem, For drawing db ; Thez_ aed = z.edb-fZ. ebd. (186J But the L. EDB is meafured by 4 arc CB. (211] And the L. ebd is…
Navigation · Nautical astronomy · Fortification
Internet Archive · Boston Public Library · Public Domain Mark 1.0. Free to use for anything.
