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Scientific American, Vol. 15, No. 20 (1866) (1866)

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An illustration from Scientific American, Vol. 15, No. 20 (1866), 1866, leaf 0
e former years, ary rudders, B, pivoted toz TAKING into consideration the very destructive the post and capable of§ | results of modern artillery when applied against swinging sufficiently tog granite fortifications faced with iron, or having em- elosethe aperture. It will , brasures of that metal,… … tic leaves may not be ham- We have now before us one of our letters addressed pered. Nautical men will to Mr. Barron, returned “unclaimed ” through the at once understand the merits of this invention. | of which are to be constructed by Americans, three dead-letter office. This isthe third letter…

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