51cm 



5cm 



15cm I— 



09.5mm 

 holes 



10cm 



-—5cm 



50cm 



L WING -SIDE ELEVATION 



strut 



bend at 15° 

 from horiz. 



-30° 



WING -FRONT ELEVATION 



strut 2.5cm wide 7 

 x 3.2mm thick / 



weld 



bend 



h— 10cm 



f— 10cm 

 45cm 



45.75cm 



heat 



bene 



90* 



,' 



6.3mm marine alum. 



RHOcm- 



2.5cm 



~*l\ 



5cm -J 



9.5mm holes 

 4cm o.c. 



6.3mm holes 

 ^_ 19mm o.c. 



L.WING PLAN VIEW 



DEPRESSOR- FRONT ELEVATION 



SIDE ELEVATION 



9.5mm threaded 

 brass rod 



lock nut 



012mm 

 alum, pipe 



Top half hinge threaded 

 to accept brass rod 



Hole cut in lower half of 

 hinge and in box to 

 accomodate lock nut. 



6.3mm holes 



6.3 mm 

 U bolt 



DETAIL OF TOW POINTS 



J 



Leading edge, 

 bottom of sampler 



stainless flathead 

 bolts c/w nuts 



tow bridle 

 attaches here 



FLOWMETER ATTACHMENT DETAIL 

 Figure 3.— Scale drawings of the depressor and wings, and tow point and flowmeter details. 



made with a large volume, two-boat surface trawl 

 as employed by Barraclough et al. (1966). We found 

 no significant difference (student's £-test) between 

 mean total catch (12.9 and 12.1 fish/100 m 3 ) for 

 nine taxa common to both gears in eight pairs of 

 tows made locally in the Strait of Georgia, British 



Columbia, during March-April. Among the fish sam- 

 pled by this gear in offshore and shelf waters are 

 juvenile Pacific salmon to 14 cm, Pacific saury to 

 25 cm, juvenile sablefish, rockfish, greenlings, and 

 squid, in addition to the routine catches of ichthyo- 

 plankton and general zooplankton. 



483 



