LOADING METHODS 47' 



in the mechanism frame (the graduated gauze below and the plain above the water 

 tunnel) by inserting their spindles from the right-hand side and locking them in 

 position by rotating the spring clip i till it presses on their ends. 



On disengaging the locking rods e and e' the two parts of the mechanism may be 

 separated as far as the slots in the hinge plates /and/' will allow and swung open as in 

 Fig. 1 5 ; the mechanism is now turned on its left side. The ends of the bandings are 

 passed through their respective slits gc and he, and the end of the graduated banding is 

 drawn across the water tunnel to meet the end of the plain banding. The two ends are 

 now passed together between the driving rollers m and n and the mechanism swung 

 together (taking care that the graduated banding is not trapped when closing) and 

 turned right way up. With the two parts together but not tightly closed the ends of the 

 bandings are clipped to the storage roller r so that an even pull is ensured. The storage 

 roller is then fitted into the main formalin tank by inserting its slotted spindle to engage 

 with pins in the end of the spool and inside the gear wheel qp which drives it. A screw 

 cap secures the spindles in place. Any slackness or bagging in the bandings is then 

 taken up by rotating the supply spools g and h, after which the two parts of the frame 

 are drawn tightly together by re-engaging and screwing up the locking rods. By means 

 of a detachable winding handle fitted to the square section end of the forward driving 

 roller m the bandings are wound on until the first section of the graduated gauze lies 

 across the water tunnel. The main formalin tank is now filled with 20 per cent formalin 

 and the lid closed and secured. 



Great care must be taken before loading to ensure the required tension on the gauze 

 by adjusting, if necessary, the brakes k pressing against the ends of the spools q and h, 

 and also that the slipping friction drive p is correctly adjusted so that the storage spool 

 just takes up the slack on the gauze bandings as they emerge from the driving rollers 



(see p. 499). 



The frame is now ready for returning to the body. The edges of the water tunnel in 

 front and behind are engaged with the edges of the water tunnel of the body castings 

 which are machined to receive them. The frame is now pushed home until the gear 

 wheel on the forward driving roller engages with the worm on the vertical shaft from 

 the gear box. If the cogs on the gear wheel should fail at first to engage, the propeller 

 shaft should be rotated until they do. The tongues z and ** (Fig. 8) are turned down to 

 keep the frame in place ; the doors are now closed and locked by the spring clips at the 



top and bottom. 



THE GAUZE BANDINGS USED 



Gauze bandings of different mesh may be used, but the standard gauze at present 



employed is Swiss silk bolting cloth, extra quadruple strength, 60 meshes to the inch, 



supplied by Messrs Staniar of Manchester. The bandings are 6 in. wide and usually 



cut into lengths to give rolls of 50, 100, 150, 200 or 250 sections according to the length 



of run required. 15 in. of gauze are left blank before the first section to allow for 



attachment to the storage spool and adjustment; 12 in. are left blank after the last 



section. As each section is 2 in. across the following lengths of silk sold by the yard are 



