34 
900 
or 
(g.5) (meph2at Sp Rh) Sa thea fatas - Stn Fa) dS 
By (8.5) and (8,4) one finde that the error in the effective 
mass, M, due to the incompressive anproximation is not greater 
than the right side of the inequality: 
pR* 
PENN i ee alll acv) <t-aR/e<t<# 
(8,6) a ee | 4c) where 6) 
For a crusher gauge (particularly for one subjected to a very 
heavy charge - see reference 3 page 4) we have hd&/al =17/e where 
a. is the time required for maximum displacement. Hence 4 M/M 
is in thie case avproximately 
(8,7) Lik” 1075 
6 
& 
in cge unites. For a freely moving viston, such ee one in a 
Hilliar gauge, one would exvect that ta/al = 1/0, where © is the 
time constant of the incident pulse. Instead of (8,7) one would 
then have 
(a8) aR 0° 
which 1s even smaller than (8,7). 
Rarefaction Coupling between Two Pistona 
9. The integral to be evaluated is 
LC Ca] 
ee ee Ji) pee ae 
CR.) (A) 
Lo HO ie 
