Fig 

 the 



i3- 



face 



/NCHES 

 0/234 



I . i ■ I ■ i ■ 1 i I i I i I i 1 i I i 1 



Elevation of the rear section of the internal mechanism frame looking towards the back and showing 

 which interlocks with that of the forward section shown in Fig. 12. For letter references see text. 



qm, qn. Small brackets qm acting as tongues against which the locking rod qn, passing through 

 mechanism frame, rests and holds tank in position in frame. 



qo. Rod passing through side walls of frame and pressing on the lid qc of formalin tank and so 

 keeping it tightly closed. 



qp. Straight-toothed gear wheel engaging with friction drive p and so rotating storage spool 

 within tank. 



qq. Packed bearing carrying storage-spool spindle. 



qr. Screw cap securing the spindle rb for the storage spool r, in the tank. On removing the cap 

 the spindle may be withdrawn and the spool lifted out of the tank ; when in place a slot in the end 

 of the spindle engages with a pin across the bored out centre of the gear-wheel assembly qp. 



qs. Screw cap for filling reserve tank with formaldehyde. 



r. Storage spool, see note under qr. 



ra. Strip of metal securing the end of the gauze bandings to the spool r. 



rb. Spindle for storage spool r, see under qr. 



s. Cross-bar holding together a and b, cast in one with and supporting the water tunnel. 



t. Cross-section of water tunnel covered by filtering surface of graduated gauze banding. In 

 Fig. 1 1 the floor of the tunnel is seen through t. 



ta. Floor of water-tunnel casting. 



tb. Curved edge of water-tunnel opening. Note that it ends ^ m - below the surface of the 



