APPARATUS USED WITH PLANKTON NETS 



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of the straight Hne, and in order that the messenger may meet the striking piece h 

 fairly, the latter is set at an angle of 20° to the horizontal. The apparatuses supported 



Fig. 19. Opening and closing mechanism for large horizontal nets : for explanation see text. 



on the stop shown at k, which is attached to the warp by six bolts, and, with a view to 

 obtaining a better grip, it is so made that it causes a slight bend in the warp. This stop 



