Conventional JH'leter Silk Net Model Gulf III Plankton Sampler 



Clogging results when spines of 

 some of the plankters tangle 

 with the soft fibers of silk 

 net* 



J4, Net is difficult to clean be- U. 

 cause of softness of silk 

 fibers which hold plankter 

 spineso Silk net is too fragile 

 to scrub properly, 



$» Special care is necessary to 5» 

 prevent excessive deterioration. 



6, Conventional towing bridle dls- 6, 

 turbs water immediately ahead 

 of net which very likely results 

 in many organisms evading the 

 nete 



Clogging resulting from tangling 

 of plankter spines with wire meshes 

 is less than with soft fibers of 

 silk net because of rigidity of 

 the wire meshes. 



Cleaning can be quickly and easily 

 accomplished by scrubbing with a 

 bmish. 



No special care is necessary to 

 prevent excessive deterioration 

 since monel is one of the more 

 corrosive-resistant metals. 



The towing and depressor cables 

 are attached to the sampler be- 

 hind the mouth of the net, hence 

 they do not disturb the water 

 ahead of the net. 



7, Flow as determined by current 

 meter in the mouth of the net 

 is of questionable accuracy. 



Two current meters are used, one 

 in the mouth of the net and one 

 in the housing behind the net, 

 to determine the volume of water 

 which passes through the net. 



12 



INT.-DUP. SEC. WASH., D.C. Jsjjg 



