24 - 12 - 



initial energy ria'atea in the first pjlse is 



± . jr i /S (32) 



W 2^2 C V p 



'^ 



For the small detonators this works out to be 0.43. 



The r3ppreci:iole najnitudt? of this fijure implies a consiaaraDle dejree of dampinj of ths 

 vibrations. This fact will afftct to som- jxtsnt the accuracy of tnc expressions obt-^ined for 

 p (t) and n (t). The deviatlcns arisinj will be cumulative and will not impair jreatly the 

 validity of ths formulae in tn..- e-rlier stbjes of the expansion. Tne effect will be to limit the 

 ran^e of valioity of these formulae. The effect on the formulae for T will be quite small (compare 

 with this the fact that the period of any simple harmonic vibratory system is little affected py 

 quite heavy damping). 



Formula (3^ ) shows that tne dampinj increases with p , so that the amplituje of tn; second 

 pulse should become relstively loss. It is possible, therefore, that if p is made larje enough 

 tne second pulSL may be too weak to oe noticed in comparison. 



