Uttmark's guide to the United States local inspectors examination for masters and mates of ocean going steam and sailing ships (1919)
Uttmark, Fritz E · [New York] The Author · leaf 82
the end of thelog-line. The lead is thrown overboard and the speedmeasured by the aid of the log-glass in the usual man-ner. The ships course is opposite to the directionof the log-line. Use your compass to ascertain this. The Patent Log The patent log is a mechanical device to ascer-tain the speed… … Compensating Binnacle
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