Product images of Walker's Patent Harpoon Ship Log A.1
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Walker's Patent Harpoon Ship Log A.1
The mechanical log recorded the speed and distance run by a ship, which was vital information in recording daily progress. It worked by being thrown overboard and dragged behind the ship. As it was dragged along, the log rotated and the revolutions registered on the dials on its side. This example is made of brass with an enamel plate for the three dials, which are marked in miles from 0 to 100 in tens, from 0 to 10 in units, and from 0 to 1 in quarters. Each of the five fins at the back is inscribed with an anchor above the letters 'T W' (for Thomas Walker).
- Image reference: D5333
- National Maritime Museum, Greenwich, London