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 227
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 upon the table so that the rule shall extend across its centre; loosenthe large milled-head screw projecting below the top… … operation, clamp the . large screw again, and \ ?B the table is level. Now free the tangent screwby loosening its clamp,place the edge of therule ;- upon the occu-pied point J and thepoint l>, the telescopebeing directed towardthe spire B, as shownby the arrow-head inthe figure, and revolvethe…
Navigation · Nautical astronomy
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