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<p>investigated the average depth of the <a href="page.php?w=Atlantic_Ocean">Atlantic Ocean</a> by observing tidal motions registered on <a href="page.php?w=Brazil">Brazil</a>ian and <a href="page.php?w=Africa">Africa</a>n coasts circa the late 18th or early 19th century. However, the exact date of his investigation is unknown.  He calculated the depth to be 3,962 m, a value later proven quite accurate by <a href="page.php?w=Echo_sounding">echo-sounding</a> measurement techniques. Later on, due to increasing demand for the installment of <a href="page.php?w=submarine_cable">submarine cable</a>s,</p><p>
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