Elements of acoustical engineering (1940) Elements of acoustical engineering elementsofacoust00olso Year: 1940 10 D/X CUBE (jl = 0° :: 30* ^v ^ ^ z \ I 5 m a 2 0 r<l tf- .\^ = — 60° ^ \y 90° 's; ^ ^ & r 42?^ J80° o ^ DIRECTION OF •n^ > X '* NORMAL ' \ I _ t_ U. 1 1 J 1 Lj L/X SPHERE , 30° <^ SSBS ss z = , 90° . ISO » s ^ • 120° fr\^_ ^^/^, PLANE WAVE 'n • 150° \ —1 9 u L. 1 1 1 L_ .04 .06 Fig. The diffraction of a sound wave by a cylinder, cube and sphere. (After Muller, Black and Dunn.) Another example of difFraction of sound is illustrated by the zone plate shown i

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Elements of acoustical engineering (1940) Elements of acoustical engineering elementsofacoust00olso Year: 1940 10 D/X CUBE (jl = 0° :: 30* ^v ^ ^ z \ I 5 m a 2 0 r<l tf- .\^ = — 60° ^ \y 90° 's; ^ ^ & r 42?^ J80° o ^ DIRECTION OF •n^ > X '* NORMAL ' \ I _ t_ U. 1 1 J 1 Lj L/X SPHERE , 30° <^ SSBS ss z = , 90° . ISO » s ^ • 120° fr\^_ ^^/^, PLANE WAVE 'n • 150° \ —1 9 u L. 1 1 1 L_ .04 .06 Fig. The diffraction of a sound wave by a cylinder, cube and sphere. (After Muller, Black and Dunn.) Another example of difFraction of sound is illustrated by the zone plate shown in Fig. The path lengths of the sound from the source to the focus varies by an integral wavelength. As a consequence, all the pencils

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