in other words where the velocity of the current is uni We pay to England annually $698 for copper ships to prevent the attack of sea worms and the adher THE OBSTRUCTION TO THE NAVIGATION OF RIVERS CAUSED BY THE PIERS OF BRIDGES. BY J. W. SPRAGUS. that it would not materially affect the result in soch were an immovable floating pier., scientific american, 1860-04-07

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in other words where the velocity of the current is uni We pay to England annually $698 for copper ships to prevent the attack of sea worms and the adher THE OBSTRUCTION TO THE NAVIGATION OF RIVERS CAUSED BY THE PIERS OF BRIDGES. BY J. W. SPRAGUS. that it would not materially affect the result in soch were an immovable floating pier., scientific american, 1860-04-07

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