Hydrographical surveying : a description of means and methods employed in constructing marine charts (1920)
Wharton, W. J. L. (William James Lloyd), 1843-1905, Field, Arthur Mostyn, 1855- · London : J. Murray · leaf 415
the positions for graduation.Calculate spherically, as before, the bearings of C and D fromone another, and lay off the meridians C N, D M. From C and D lay off the perpendiculars C H, D F, and 25 386 HYDROGRAPHICAL SURVF.YING [chap. xvii. from these perpendiculars lay oflf, on the side of the… … the same parallel as C, and G as D, and J D, C G, should beequal.* To get the central meridian of the chart, bisect J C andD G in A and B, and join them. Then J G joined should intersect C D in the central meridian.This is a capital check for our correctness so far. * See Appendix B. CHAP. XVII.]…
Hydrographic surveying · Nautical charts
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