272 (#358) ############################################ WOOLLEN AND WORSTED SPINNING 1. The balance of a set of drawing is primarily dependent upon the following factors : (a) Speed of delivery from preceding box to the box under consideration ; (6) Speed of intake or delivery of the box under consideration ; (c) The effects of doubling ; (d) The effects of drafting; (e) The effects incident upon the foregoing, such as twist, theoretical and actual speeds, etc.; () The effects of " doffing," " stoppages,” etc. The principles involved will be most clearly realized if in the first place (a) and (b) “ sliver speeds” are taken to be the same ; i.e. the speed which a sliver is delivered from a preceding box just feeds the speed of intake of the succeeding box. Under these circumstances the domin- ance or otherwise of draft over doublings in the succeed- ing box will decide the spindles of the succeeding box. There are three possible conditions :- 1. Doubling exceeding draft : say four slivers up with a draft of two; 2. Doublings and draft equal : say four slivers up with a draft of four ; 3. Doublings exceeded by draft : say four slivers up with a draft of eight. It will be obvious that, in the first case, the sliver de- livered will be half the lengths of the slivers going into the box, as graphically shown in Fig. 81 (a). In this case, if box I is a two-spindle box, box 2 need only be a one- spindle box—there would actually be reduction in the spindlage from first to last in a set of drawing designed on this basis. But the sliver would get thicker rather than thinner ; so that it may be taken that this method 272
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