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
nythem, 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 thesignal A upon theground; /, the spireB; c, the signal C;and s, the station S;the small letters onthe… … \. H 184 SURVEYING. lion, also approximately, by the eye, so that the plotted points on the sheet are in range with the station S andthe sig^nals or objects they represent in the field. Then plumb the point j over the station S, fixing the legs of thetable firmly in the ground; place the alidade…
Navigation · Nautical astronomy
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