215 (#287) ############################################ TYPES OF DRAWING MACHINES slivers from any machine due deference must be paid to their feed into the next machine. In balling slivers for strong or finishing boxes, or in adopting balling- heads rather than can-deliveries for the gill-boxes of drawing sets of machinery, care must be taken to avoid feathering ”—that is, a roughing-up of the fibres from the edges of the slivers and incorporation into the earlier unwound coils from the ball. Thus the tendency of the wool composing certain slivers to cling (no doubt due to treatment in the earlier processes) may necessitate different forms of delivery and feed. "Can "-delivery for open slivers is usually satisfactory, but it entails additional expense in comparison with ball delivery. In the case of French drawing machinery, if the rubbers are acting efficiently, ball or cheese delivery should be absolutely efficient. The ingenious French method of winding two slivers into one ball of course gives double the pulling-off strength and in the case of the finer meches undoubtedly helps to obviate strained and irregular slivers. Floor space available is another factor to be taken into account—but nothing can com- pensate for inefficiency in either taking-out of or feeding- into worsted drawing machines. (6) The Passage through the Machine Mechan- isms. The parts of the machine here involved arem 1. Back rollers and their control; 2. Fallers, porcupines or carriers; and 3. Front rollers. The construction of the back rollers must be thought out with a clear insight into their functions. Obviously they must- Draw-off the sliver or slivers from the feed mechanism regularly and positively ; 215
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