Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 275
he forward part, which is kept fromrevolving by two straight blades, contains a registering appara-tus, which is connected with the rotator, and shows the dis-tance. 12 NAVIGATION. The Patent Taffrail Log, one form of which is shown in Fig. 6,consists of a registering apparatus which is permanently… … Fig. 6. The Ground Log consists of the ordinary log-line with a hand-lead substituted for the log-chip. When it is hove, the leadsinks to the bottom and remains stationary. The line reeledoff gives the speed over the bottom. This log is not affectedby tides or currents. It may be used in shallow…
Trigonometry · Surveying · Navigation
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
