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" ... number of geographical miles, as a half or quarter minute is to an hour of time, is wound about a reel. The whole is employed to measure the ship's head-way in the following manner: The reel being held by one man, and the half-minute glass by another,... "
Putnam's Home Cyclopedia ... - Page 330
by G.P. Putnam & Co - 1852
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Dana's Seaman's friend

Richard Henry Dana - 1856
...held by one man, and the half-minute glass by another, — the mate of the watch fixes the pin and throws the log over the stern, — which, swimming...being slackened over the stern to prevent the pin from coming out. The knots are measured from marks on the line, at the distance of twelve or fifteen...
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The Americana: A Universal Reference Library, Comprising the Arts ..., Volume 13

Frederick Converse Beach, George Edwin Rines - Encyclopedias and dictionaries - 1912
...being held by one man, and the half-minute glass by another, the mate of the watch fixes the pin and throws the log over the stern, which, swimming perpendicularly,...as fixed, the line being slackened over the stern LOG-BOOK — LOGAN to prevent the pin coming out. The knots are measured from a mark on the line at...
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