Text table 2» Station lines scheduled to be occupied on cruises 11 

 through 16, February-September 19$0e 



Cruise 



"11 12 ' 13 [ nr 15 iS TT TF 



B B B 



B B B 



B B B 



B B B 



C H H 



C H H 



C H H 



C H H 



C H H 



C H H 



H C C 



H C C 



H C C 

 HOC 



H C C 

 HOC 



Throughout the report, vessels used on survey cruises are designated 

 by the following letters; B - Black Douglas ; C - Crest ; H - Horizon ; P - 

 Paolina T. 



MEASURH^-IEIIT OF VOLUME OF WATER STRAINED DlJRING PLAffiTON HAULS 



A measure of the voltune of water strained during a haul was derived 

 from current meter readings. An Atlas-type current meter was fastened 

 in the center of the mouth of each net. Seven current meters were used 

 during cruises 11 through 16. Two were lost at sea during this period, 

 current meter No. 6 on cruise 12, and current meter No. $ on cruise 13c 



The current meters were calibrated before and after each cruise 

 on vihich they were used. In calibrating, the current meters x^^ere towed 

 over a measured distance at different speeds. Performance graphs were 

 constructed in v/hich the length of the column of water strained per 

 revolution of the current meters (meters/rev) was plotted as the depen- 

 dent variable against the rate of towing (revolutions per second). 

 Since these performance tests were made both before and after each 

 cruise, the graphs applicable to a given cruise i<iere a combination of 

 two calibration trials. 



.5.. 



