148 COMPUTATION FROM TEST DATA 



reading at 1,000 c to be 1 14.8 db vs lO" 10 watt. Cor- Thus, the absolute calibration of the 3A hydrophone 



recting this for the receiving gain (20 db) gives can be computed at 1,000 c: 



/.„ = 94.8 db vs 10- 16 watt. R, = i/ 2 (-379.7 + 94.8 + 95) 



„..,.. , , • r - oi = — 95.0 dbvs 1 volt across 600 ohms 



Similarly, from the chart in figure 21, 



L] ; = 115 - 20 = 95 dbvs 10" 16 watt, for a sound field of 1 dyne per sq cm. 



