420 



BELL SYSTEM TECHNICAL JOURNAL 



TABLE IV 



1.2 



Fig. 2.12.2— Plot of Column (3) vs. Column (10) of Table III. 



A difficulty arises because the integrand (IF2// — An)~^ becomes infinite 

 for the maximum displacement (see Column (14)). This is avoided by 

 assuming that the acceleration is constant in the last interval^ and has the 



" Timoshenko, "Vibration Problems in Engineering," D. Van Nostrand Co., New York, 

 Second Edition (1937) page 123. 



