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Scientific American, Vol. 79, No. 14 (1898) (1898)
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t the mouth of the harbor. on the buoy being Our battleships and armored cruisers could easily struck by a passing ves- have forced the entrance if the nondescript batteries sel, swings into contact with ametallic ring and that guarded it had been the sole means of defense. It was known, however,… … © 1898 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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