The new American practical navigator : being an epitome of navigation, containing all the tables necessary ... (1802)
Bowditch, Nathaniel, 1773-1838, Lee, Marvin, former owner. DSI, Stuart, Gilbert, 1755-1828 DSI, Burndy Library, donor. DSI · [Salem] : Printed at Newburyport, Mass., 1802, by Edmund M. Blunt, for Cushing and Appleton, Salem : Sold by every book-seller, ship- chandler, and mathematical-instrument-maker in the United States and West Indies · leaf 220
10.00028 To find the diftance CD. As fine angle BCD 330 44/ ar.co. 0.25545 Is to fide BD 10 1.00000 So is fine angle CBD Xa° 30 9.58284 To the diftance CP 6,89 0.83829 Sum is angle BDC = .123 46Diff. is angle BCD = 33 44 or nearly 3points, and as the bearing of B from C is S. byW. the bearing of D… … By PROJECTION, Draw the horizontal line ABrr96fathoms, and perpendicular thereto,the line BC ; make the angle BAC=150 10, and draw AC to cut BC inC, then will BC be the height of thetower 26 fathoms. By LOGARITHMS, As radius 90° 10.00000 Is to the dift. AB 96 fath. 1,98227So is tang, angle A 150 io…
Navigation · Nautical astronomy
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