The American practical navigator : being an epitome of navigation and nautical astronomy (1888)
Bowditch, Nathaniel, 1773-1838, United States. Navy Dept. Bureau of Navigation, Cooper, Philip Henry, 1844-1912 · Washington : Govt. Print. Off. · leaf 226
ich are notperpendicular, the sight-ing should be as nearlyas possible upon thebase of the pole. ^ Art. 426. FUId^practice. — Topograph-ical points can be determined by three methods, viz : prosection, resection, and measured distances. In thefirst of these the point must be seen from two or more… … A frompoint. the occupiedThese meth-ods of determina-tion, and the inci-dental operationswhich accompanythem, will now beconsidered. Let O, P, Q,R, Fig. I, representthe board of theplane-table, uponwhich is spreadthe topographicalsheet; the plottedtriangulation pointa upon the sheetrepresenting…
Navigation · Nautical astronomy
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