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A Ship’s Log

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A Ship’s Log.jpg A Ship on the WaysThumbnailsA Steam Frigate—the U. S. S. HartfordA Ship on the WaysThumbnailsA Steam Frigate—the U. S. S. HartfordA Ship on the WaysThumbnailsA Steam Frigate—the U. S. S. HartfordA Ship on the WaysThumbnailsA Steam Frigate—the U. S. S. Hartford

The mechanism at the top is fastened on the ship’s rail, and a line with the rotator shown below at its end is allowed to trail in the water astern. The passage of the rotator through the water causes it to turn, the line is twisted, and the log is made to register the miles travelled.