Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 310
ounts the number ofknots run out during the time required for the sand to runthrough the glass. The line is given a quick jerk, whichdetaches the two lower of the three cords by which the log-chip is attached to the line, the log falls flat, and is readilydrawn in. Since each knot is… … Fig. 7 322 NAVIGATION The Patent Harpoon Log, one form of which is shown inFig. 8, consists of a brass cylinder, which is towed throughthe water after the vessel by a line about 50 fathoms long.The cylinder consists of two parts. The hinder part, or
Trigonometry · Surveying · Navigation
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