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 126
113 Draw the line BD equal to the departure500 miles, and perpendicular thereto drawthe meridian line ABC ; take an extent equalto the diftance 645 in your compares, andwith one foot inDfweep an arch cutting ABin A, join AD, then will AB be the differ-ence of latitude 407,5 miles, and BAD… … By LOGARITHMS, To find the courfe.As the diftance 645 2.S0956 Is to radius 900 10.00000 So is the departure 500 2.69897 To fine courfe 500 49 9,88941 To find the diff. of lat.As radius-900 10.0000c Is to the diftance 645 2.80956 So is confine courfe 500 49 9.8005S To the diff. of lat. 407,5 2.61014…
Navigation · Nautical astronomy
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