SOURCE-RECEIVER SEPARATION INCREASING 
te 
TRAVEL TIME IN SECONDS 
ENT 
. 
HOISTING 
HOVERING 
OFF BOTTOM 
106 FT. ee 
SEA SURFACE 
DAWN eee 
To—T,= A MEASURE OF 
INSTRUMENT HEIGHT 
ABOVE BOTTOM 
Ww 
(o) 
WwW 
= 
= 
PINGER 
CABLE SUSPENDED 
CAMERAS 
CORERS 
DREDGES 
ETC. 
SEA FLOOR aaa piers aa LOWERING 
SCHEMATIC PGR RECORD 
Figure 8 
261 
