A. B. Wood 179 
Fig. 10.15. Vertical scan 
over the range from 0.6 to 
4,3 m at frequencies of 640, 
600, 500, and 400 kcps. 
Water is two inches deep 
and the bottom is steel. 
(4) 400 KC 
om 
" 
= 
= 
m 
4 
m 
y°) 
Fig. 10.16. Transverse 
vertical scan records at d 
1-, 2-, 3-, and 4-m range. 
The bottom is steel, water 
is 2 in. deep, and the fre- 
quency is 440 kcps. 
" 
nN 
< 
m 
s 
m 
vy 
n 
d = 4 METERS 
