Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 309
of cord having one knottied in it; the end of the second knot is markedby a cord with two knots tied in it; the eodof the third knot is marked by a cord withthree knots tied in it; and so on. The stray line allows the log to settlein the water clear of the ship before themeasurement of the rate… … Fig. 6 To find the length of a nautical mile. If the radius of the earth is 3960 statute miles, the circum-ference of the earth, 2 nrr, is 2 x 3.1416 x 3960 statute miles= 24881.4720 statute miles. Length of 1° = 24881.4720 statute miles -- 360 = 69.1152statute miles. - fiQ11?i9 Length of 1 = 1…
Trigonometry · Surveying · Navigation
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