BUBBLE PULSE 



STILL WATER LINE 



BEACH IS USUALLY VERY FLAT 



SPILLING BREAKERS 



GENERAL CHARACTER OF SPILLING BREAKERS 



STILL WATER LINE 



PLUNGING BREAKERS 



GENERAL CHARACTER OF PLUNGING BREAKERS 



FOAM LINE 

 OF 4 



SURGING BREAKERS 



GENERAL CHARAOER OF SURGING BREAKERS 



TYPES OF BREAKERS 



[AFTB WIECa, 19S3( 



bubble pulse — A pulsation cattributable to the bub- 

 ble produced by a seismic charge fired in water. 

 Tlae bubble pulsates several times with a period 

 proportional to the cube root of the weight of 

 the charge ; each oscillation produces an identical 

 unwanted seismic effect. (4) 



bucket temperature— The surface temperature of 

 the sea as measured by a bucket thermometer. 



bucket thermometer — A thermometer used to 

 measure the temperature of a bucket of water 

 drawn from the surface of the ocean. 



Bug Battery — A bacteria-filled fuel cell in which 

 certain biological organisms act as supercata- 

 lysts in promoting electrochemical reactions. 

 The Navy has sent radio signals more than 15 

 miles powered by this device. This new concept 



26 



