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Otter boards for trawl nets

阅读:478发布:2021-05-22

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  • 6. AN OTTER BOARD COMPRISING, A BOARD HAVING A CENTER OF GRAVITY AND A FIRST POINT WHERE A SHEARING FORCE EFFECTIVELY ACTS NORMAL TO SAID BOARD AS THE LATTER IS TOWED THROUGH WATER, SAID FIRST POINT BEING ABOVE AND AHEAD OF SAID CENTER OF GRAVITY WHEN SAID BOARD IS BEING TOWED THROUGH WATER, A TOW LINE, AND MEANS FOR COUPLING SAID TOW LINE TO SAID BOARD SO THAT THE FORCE EXERTED ON SAID BOARD WHEN THE LATER IS TOWED BY SAID LINE ACTS ON SAID BOARD THROUGH A SECOND POINT THEREON, SAID SECOND POINT BEING ABOVE AND AHEAD OF SAID FIRST POINT WHEN SAID BOARD IS BEING TOWED THROUGH WATER.
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