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 691
LEMS. To find the distance and height of an inaccessible object on a horizontal plane. Let A be the top of an object, and let it be required to find its height, AB,and the distance of the object from a point, I), in the horizontal plane through B. At D observe the angle ADB = 44°, then measure any… … DC B 111 the triangle ADB, ADADB AD = DC = 294ACD = 121° DAC = 150 AD = 961 sin DAC log 2.46835 log sin 9.92842log cosec 0.58700 l0£ 2.98277 AB = AD sin ADB and DB = AD cos ADB. = 961 = 44° Height, AB = 667.6Distance, DB = 691.4 log 2.98277log sin 9.84177 log 2.82454 log 2.98277log cos 9.85693 log…
Navigation · Nautical astronomy
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