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 215
found 36 miles, and AC30. miles. By LOGARITHMS—(by Cafe I. Obi. Trig.) The difference between N. N. E. and W. N. W. is 8 points or 90°*therefore BAC is a right angle • alfo the difference between the N. E. byE. and N. N. E. is 3 points = angle ACB, and the difference between theN. E. by E. points… … To find the diftance BC.As fi. angle ACB 3 pts. ar.co. 0.255;26Is to the diftance AB 20 1.30103 So is fine angle BAC 8 pts. 10.00000 To the diftance BC 36.0 1.55629 To the diftance AC, 29.93 1.47614The above folutions are by Cafe I. Oblique Trigonometry, though theymight hare been done in this…
Navigation · Nautical astronomy
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