4 86 



DISCOVERY REPORTS 



plates u and so leaves a gap, up which the plankton passes on the gauze, to be xmpr onM by the 

 second gauze banding coming through the slit immediately above the top of the water tunnel. 



u ua The plates u, «', against which the edges of the graduated gauze banding pass up are 

 A i below theW la, L/which when the frame is closed press fcghtl, ^ns the fac o h 

 hind-section of the frame. This arrangement allows a narrow recess to take the thickness 

 gauze banding. 



ub 



Plate above the slit gc 



Fie u Perspective drawing of the internal mechanism frame seen from the right front with the two parts 

 locked together by the clamping rods e and e. For further letter references see text. 



v Cross-bar making close joint with the recess va at the base of the face of the hind-section 

 so locating the two sections of the mechanism frame and sealing the gap in the water tunnel except 

 for the narrow slit through which the gauze banding passes. 1 



va. Recess into which fits the bar v. 



w. Face cast in one with hind-section of the water tunnel. 



wa. Plate continuous with face w. 



x x' Vertical bars crossing section of water tunnel and holding xa. 



xa Horizontal rollers on fine spindles between the bars x. The function of the bars and rollers is 

 to give support behind the gauze banding which passing up in front of them is subjected to the 

 pressure of the water flow through the tunnel. 



y. Exit from water tunnel. 



1 See footnote on p. 466; the same applies to this type 11 machine. 



