864 
g - gauge. 
= force constant of covper vellet cornected for dynamic strain 
rate. 
m= 0,/9. 
n = 0,,/20. 
» = instantaneous total pressure due to incident wave and wave 
thrown back by gauge (minus hydrostatic pressure). 
De- instantaneous pressure of incident wave in ebsence of gauge 
r = ratio of pressure at surface of rigid block to 2p,= a measure 
of effect of recoil of block. 
r = distance from a point in pressure field to an element of area. 
s = distance between centers of two orifices ina gauge. 
t = time. 
v= material velocity of water. 
v = magnitude of v. 
So velocity of bloek or baffle. 
a. material velocity in incident wave. 
z = coordinate normal to T,, positive in direction of recoil. 
zp= z coordinate of surface T. T may be specialized to A, B, or Co. 
© = time-constant of incident pulse, i.e., time required for vressure 
in incident pulse to decay to 1/e th of its peak value. 
6,> Rp/e = diffraction time of block or baffle. 
@,= cavitation time. 
@qa- Ppi/pe = damping time of block. 
O5- time constant of gauge, i.e., time required for gauge to register. 
6,= R/e = diffraction time of piston. 
6,= 24/0}, = time for sound to cross block twice. 
= Wal oe 
