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Show I VESSELS STEERED BY SOUND. There were secrets kepi from tin- pno-lii during the war which now arc being disclosed. When oui nayj was stripped for action, the hattlffchip uiovad in and out "i pur harbors where prrat mine fields had been placed and il was .i mystery to those who were noi in the confidence oi il eouinisiutvrs hoM the ships could maneuvi even in penods "t iu' withoul running into the mines n Wed uesday tin- method employed was made public whan thr destroyer Srmmos entered Xew York harbor si erred hy a -onimandei who had Ins view obstructed so be could not see i h- channel oi the course hu lioai was tal ing It is related ttial the only thing ili' commando ba,d as s gujdc - as the clicking of a telegraph instruinenl reneatknz X-A-VY. This is the applanation oJ the achievement. The ship carries instruments which allow 'n to be guided b au-dip-frequency sound waves, There! are c-Oils of copper ir- in the-bows, the-bows, which pick up electric impulses from an insulated electric eable laid thr- entire length 6f the 6haiueJ Amplifiers am attached loan ordinary set of telephone receivers to magnify the electric im- pulses. There constantly is beii)g' sounded over lho entire length f ih'.1 laid, the letters in "navy? and all that is necessary on thi iart of the man on the bndgi "i a siuj with the telephone receivers to his ears is to pilot his reaae so sj to keep within the maximum! of sound waves, which .-an be cBUght at a distance of 1000 feet on either sick- of the ' aides on thr- bottom of the Channel The dots and dashes become louder or Eaintes as the ship is guided to r from the eourse on which the cables are laid. M is a simple device bu1 promises prom-ises to facilitate the aavigating of harbor entrances during iFogs and prevent wrecks. |