NEW USE FOR SOUND
Making use of sound waves, pilots guide their ships into port at Ludington, Michigan. U.S.A., by checking the harbour foghorn against the radio beacon. The Ludington lighthouse broadcasts a signal and sounds a foghorn at the same time. Out on Lake Michigan on the bridge of a steamer, a navigator hears the radio beam and notes the interval of seconds until he hears the foghorn. Sound travels roughly a mile in five seconds. If the foghorn is heard ten seconds after the radio beam, the pilot knows he is two i miles from harbour,
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Bibliographic details
Evening Post, Volume CXXIII, Issue 147, 23 June 1937, Page 22
Word Count
98NEW USE FOR SOUND Evening Post, Volume CXXIII, Issue 147, 23 June 1937, Page 22
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