... 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 330by G.P. Putnam & Co - 1852Full view
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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...