212 



TRANSMISSION OF EXPLOSIVE SOUND IN THE SEA 



SHOTS 9 AND 10, FEB 26, 1942 

 DEPTH OF CAP 80 FEET, DEPTH OF HYDROPHONE II FEET, RANGE 1200 YARDS 



TRANSMISSION OF ISOTHERMAL WATER 



B SHOTS 2 AND 4, APRIL 3, 1942 



DEPTH OF CAP 100 FEET, DEPTH OF HYDROPHONE 54 FEET, RANGE 610 YARDS 

 DOWNWARD REFRACTION, TRANSMISSION IN DIRECT ZONE 



C SHOTS 25 AND 26. MARCH 19, 1942 



DEPTH OF CAP 50 FEET, DEPTH OF HYDROPHONE 10 FEET, RANGE 1520 YARDS 



DOWNWARD REFRACTION, TRANSMISSION INTO SHADOW ZONE | 



Figure 16. Typical examples of the reproducibility of records of explosive pulses for shots fired a few minutes apart. 



