maere 
oO 
(eo) 
aS 
je) 
Oo 
(eo) 
o 
{e) 
3000\—gers es 
GUAIN (4 20 SNE ef (RES ERS wets e res SS 
= 
es 
Figure 3 
DEPTH IN FATHOMS 
C= 800 FMS/SEC 
PREAMPLIFIER 
FILTER FILTER 
BROAD BAND 
SOUND 
SOURCE- 
AMPLIFIER AMPLIFIER TRIGGER 
CHANNELT CHANNELID ANDO 
POWER 
SUPPLY 
MARKERS. PROGRAM PROGRAM RECORDING 
& SCALE CONTROL CONTROL SPEED 
CHANNELT CHANNELT CONTROL 
PULSE RECORD RECORD PULSE 
PROGRAM PROGRAM PROGRAM PROGRAM 
COMMUTATOR COMMUTATOR COMMUTATOR COMMUTATOR 
al zs 
KEYING 
CHELIX cMELIX 
HELIX HELIX 
PRECISION AC 
SOURCE 
Figure 4 
259 
