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!!!!1483 __ Underwater acoustics * Leonardo da Vinci (1452-1519) * ''Comment :'' “If you let your ship stop and dip the end of a long blowpipe in the water and hold the other end to your ear, then you can hear ships which are very ^[far^] distant from you” ''(Leonardo da Vinci, 1483 ; quoted in “Fundamentals of noise and vibration”, 1998, edited by Frank Fahy & John Gerard Walker, Taylor & Francis, p. 375)'' * ''Attached references :'' {small}Jean-Daniel Colladon (1802-1893), ''measure of the sound velocity in the waters of Lake Geneva'' (1826) ; Lazzaro Spallanzani (1729-1799), ''theory of echolocation'' (1794) ; Pierre Curie (1859-1906) & Jacques Curie (1856-1941),'' piezoelectric effect'' (1880) ; Alexander Belm (?), ''underwater echo-sounding device'' (1912) ; Lewis Fry Richardson (1881-1953), ''underwater echo ranging sonar'' (1912) ; Reginald Fessenden (1866-1932), ''sonar'' (1914) ; Paul Langevin (1872-1946) & Constantin Chilowski (?), ''Hydrophone - high frequency ultrasonic echo-sounding device w/ piezoelectric transducer'' (1917) ; Sir Edward Victor Appleton (1892-1965), ''use of radio echoes to determine the ionosphere’s height'' (1924) ; Sir Robert Alexander Watson-Watt (1892-1973), ''RADAR system'' (1935).{/small} * ''Sources :'' {small}K.F. Graff. (1981). ''A History of Ultrasonics''. In ‘Physical Acoustics’, Vol. 15. Mason & Thurston (Eds). Academic Press.{/small} {br}{br}
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