562 
FIG. A2. 
GROUP VELOCITY, Cy » OF EXTENSIONAL AND FLEXURAL WAVES 
OF WAVELENGTH /\ IN CYLINDRICAL BARS oF RADIUS 2. 
<a ety 
rhe . a - 
Ss ec 
/ FLEXURAL WAVES. | FLEXURAL WAVES 
(ELEMENTARY THEORY) 
\ 
ae 
Ses 
€2 = VELEITY OF BISTORTIONAL WAVES. 
@, * VELSEITY OF RAYLEIGH SUPFACE ; 
, = VELSEITY OF INFINITELY SHemT WAVES 
@N FIM@SHENKG’S THESRY: 
% , VALUES BERWVER Reem TIM@SHENKS'S 
een wen 
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