184 THE BELL SYSTEM TECHNICAL JOURNAL, JANUARY 1952 



heel impact immediately follows the last front impact of the series. 

 These cases occur at 



Q = 



1 - fc" 



k — k"" 



(30) 



and lead to rebound ampUtudes 



2CFi = Mi2 + (1 - Mi2)[/c'" - Mx2(l - /c")'] 



(31) 



In Figs. 5 to 10, these special points are plotted and connected with 

 straight dotted lines, which therefore indicate upper limits to rebound. 



Fig. 7 — Relative maximum rebound amplitude for Mio = 1/4. 



