Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 274
3600 s. : 30 s. : : 6080 ft.: x = 50* ft. As a vessel generally overruns herreckoning, the knot corresponding to a30-seconds glass is made 50 ft. The pro-portion would give 47-^j ft. as the lengthFie- 3- of the knot corresponding to a 28-seconds glass, but in practice it is made 46 ft. 8 in.The… … Fig. 4. It remains nearly stationary in the water while the line isreeled off as thevessel moves for-ward. The in-stant that themark indicatingthe end of thestray-line passesover the side ofthe ship, the glassis turned. Theoperator then counts the number of knots run out during thetime required for…
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