223 (#295) ############################################ TYPES OF DRAWING MACHINES 3. If now (1) and (2) be combined it will be found to be quite possible to deliver the sliver at such a rate that :- (a) the bobbin being braked by washers on the spindle and always tending to lag behind will, by lagging behind, wind up upon itself any sliver that may be delivered to it; and further, just so far as the condition of sliver- delivery necessitates, will follow the spindle in its revolution, thus putting in twist. The actual twist is decided by the delivery of sliver in relation to the revolutions of the flyer minus the revolutions necessary for winding-up.” Thus the total turns of the flyer from the beginning to the end of any given bobbin are absorbed in- (i) Twist in the yarn-say 98 per cent. of the total revolutions; and (ii) Coils of yarn on the bobbin-say 2 per cent. of the total revolutions. By pulling the yarn off one end of such a bobbin the whole of the revolutions of the flyer may be transferred into twist in the yarn; or by pulling off the other end of the bobbin the revolutions of the flyer represented by the coils of yarn on the bobbin may be again sub- tracted from the twist, thus- total revolutions of Ayer - coils of yarn on bobbins length in inches turns per i in. The action of flyer and bobbin illustrated in terms of the revolution of the flyer as the unit is illustrated in Fig. 64. The action of flyer and bobbin illustrated in terms of the revolution of the bobbin as the unit is illustrated in Fig. 65. a 223
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