Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 311
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 … Fig. 8 rotator, is made to revolve by four curved blades as the logis drawn through the water; the forward part is kept fromrevolving by two straight blades, and contains a registeringapparatus connected with the rotator, which shows the distance.
Trigonometry · Surveying · Navigation
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
