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Show i r I Steel Net to Guard New York Harbor Map shows how the new steel net, now 'being made aboard the old monitor moni-tor Amphitrite at the Brooklyn navy yard, will guard New York harbor from the Invasion of submarines. The net Is constructed of heavy steel cable and cross-sections of huge chains, and will be the largest and strongest ever constructed con-structed in this country. It will stretch from Eockaway point to Sandy Hook and Is especially heavy in the sections which cross Ambrose, Swash and Main channels. T II MAP II ik &f SHOWING j li VQ HOW NT 1 ' roRT OL. WIJI GUARD A 1X . tiins ' SANDY HOOK |