SURFACE AND BOTTOM REFLECTIONS 
(c) 24 Ibs. GC. at 15 ft. (d) 2t lbs. G.C. at 15 ft. 
Charge and gauge to surface Charge and gauge to surface 
= Palleinte = 21 ft. 
Charge and gauge to bottam Charge and gauge to bottom 
= 21 ft. Siete 
Both surface and bettom . Note large amplitude bottan 
reflections shown clearly. reflection, 
(g) 185 lbs. G.C. at 20 ft. (h) 250 lbs. T.N.T. at 47 ft 
Depth of charge and from p.e. gauge. The 
gauge 15 ft. latter hung 14 ft. from 
0.5 om. = .001 sec hull of ship ("corcar). 
Note surface reflection. Note marked hull reflection and 
slight tension developed, 
(Upper part of main peak 
accidentally out off in 
original record), 
VELOCITY RECORDS 
(a) Time Scale 2,000 per sec, (a) Repeat of (a). ~ 
with large number of 
harmonies. 
