LONGITUDINAL MODES IN CYLINDERS AND SLABS 



c g b f 



961 



A Cor IMAGINARY) 



TT 



a REAL 



Fig. 1 — ^Lines and intersections, discussed in the correspondingly lettered paragraphs 

 of the text, which determine the properties of the first five branches of the longitudinal 

 modes for a material obeying the Cauchy condition. Two coincident pairs of points are 

 marked (2). 



Z=i2fI7p 



c=V(277+X)^ 



= 00 



A (or IMAGINARY) 



a REAL 



Fig. 2 — A rough sketch of the branches determined by the properties illustrated in 

 Fig. 1. 



