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The elements of navigation; containing the theory and practice. With the necessary tables, and compendiums for finding the latitude and longitude at sea. To which is added, a treatise of marine fortification. Composed for the use of the Royal Mathematical School at Christ's Hospital, the Royal Academy at Portsmouth, and the gentlemen of the Navy .. (1786)

Robertson, J. (John), 1712-1776, Wales, William, 1734?-1798, Wilson, James, M.D., of London · London : C. Nourse · leaf 321

An illustration from The elements of navigation; containing the theory and practice. With the necessary tables, and compendiums for finding the latitude and longitude at sea. To which is added, a treatise of marine fortification. Composed for the use of the Royal Mathematical School at Christ's Hospital, the Royal Academy at Portsmouth, and the gentlemen of the Navy .., 1786, leaf 321
he flars were on the meridian when firft -.J^^oblerved ; their diftance, difference of declina-tion, and difference of altitudes, at that time,are equal : If they are firft at d, b, and in thedifFeicnce of tinw; revolve to d, b ; then isknown Z.P, Z.DZB, db, and zb—ZD.Let ZB—ZD=;N; and find zb + zd… … Then j\M: ( 2i ,DB —I -f ipZB XI—S DZB i\N___ \2/,DB—T>\d — V,DZ3 X; ,N ^ /2i,DR ■y,DZBXiN \ 2;,DB 2ijiDZBXAf Or J,M={ — = ) — Ll. V^jDZB WjUZB /25;,iDZB 2SS,{VZB (IV. 193, 197) Let2L\,|DZB |-Lr,DE=:L,A ; and 2Li,|DZB.L2I.^,|DZB + Lf>rrL,3. 1,169529,96960 I,l2-l8li Then jMrzA—p..Here…

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