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Code 7061
EUR 800.00
In stock

EUR 800.00
In stock

used

1633527448Code 7061 Nautical logLog made of brass, iron and bakelite, made in England by Thos. Walker Knotmaster Log Mark IIIA London, 1930s. It is an ancient nautical instrument, which measured the distance and speed of a ship. The propeller was thrown overboard and dragged behind the ship itself, rotating it transmitted the number of turns made on itself to the three quadrants of the log. The data was then read every hour to also derive the speed. Placed in its original wooden box with brass hinges and closing hooks and complete with instructions for use. In excellent condition and in working order. Box size cm 31x16.5 h 15 - inches 12.2x6.49 h 5.9.

It's a mechanical instrument to measure the way of ship and its average speed; it has an immersed propeller connected to a revolution counter that indicates speed and covered miles. Principle of mechanical patent log was shown to the Royal Society in 1699 by Robert Hooke, but the first model produced for commercial use was patented just in 1802 by Edward Massey uncle of Thomas Walker, that succeeded him in business, filing another patent in 1866.

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Code 7061 Nautical log

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