CONCLUSIONS 
!. The nonresonant acoustic projector was designed, fabricated, and tested 
without significant difficulties. 
2. It met all its specifications. and it proved the principle of a mechanical 
projector whose operating depth, frequency, and amplitude of piston throw can be simul- 
taneously or independently varied without incurring significant interactions among the 
variables. 
3. The validity of considering the NRAP as a standard source was demonstrated. 
RECOMMENDATIONS 
1. Apply the nonresonant acoustic projector type of acoustic source to such Navy 
problems us (a) probing and characterizing the ocean’s various acoustic paths, (b) measuring 
effective horizontal sound speed over ocean paths of Navy interest, and (c} calibrating and 
measuring the sensitivity of the Navy’s ocean surveillance arrays. 
2. Promptly develop the “switchable nonresonant acoustic projector” concept for 
application to significant Navy problems. 
43 : ERECEDING PAGE BLANK=NOT FILAED 
a 
