COAXIAL 
CONNECTOR 
RUBBER MOUSSE 
COAXIAL PIEZO ELECTRIC Disc 
TERMINAL (QUARTZ OR 
H BA. TITANATE ) 
f 
ag RUBBER MOUSSE 
METAL FOIL - 
10" EARTHED To CASE & 
TO ONE FACE OF DISC 
LATEX - AIR 
COATING 
BRASS OR 
BRASS CAPSULE AL. WIRE 
QUARTZ 
osc 
ACTIVE 
SOFT RUBBER nP 
a RING b 
Fig. 10.4. 
Transducers: (a) directional transducer, (b) nondirectional transducer. 
[\ 
\J 
DIRECTIONAL CHARACTERISTICS 
OF TYPE (a) TRANSDUCERS. 
Fig. 10.5. Directional characteristics of transducers at one 
DIRECTIONAL 
CHARACTERISTICS 
OF TYPE (L 
TRANSDUCERS. 
DIAMETER 2-4cms, 
SEMI - ANGLE OF 
PRIMARY 4.8° 
DIAMETER [:5 cms 
SEMI- ANGLE OF 
PRIMARY 7-2° 
DIAMETER |-Ocms 
SEMI- ANGLE OF 
PRIMARY 10°9° 
Ba 
AMPLITUDE PHASE 
megacycle per second. 
