202 (#268) ############################################ WOOLLEN AND WORSTED SPINNING quired distribution of the yarn on the bobbin is very important in both drawing and spinning (see p. 247). The intersecting gill-box referred to under (5) is a box employed on the Continent in the gilling of fine wools prior to French drawing. The construction and action of this type of box will be realized from Fig. 59, kindly supplied by Messrs. Greenwood and Batley, Ltd. For some reason or other this box does not seem to find much favour with British spinners. This should certainly be inquired into. 2. The Open Drawing-box-This box consists of back and front rollers with carriers supporting the slivers as they pass from back to front rollers. It is made to several dimensions according to (a) the weight of sliver to be controlled ; () the length and strength of the wool forming the slivers under treatment. The sizes of the bobbins are an important factor, and must be carefully considered (see p. 241). The following calculations with reference to this type of box may be usefully considered :- I. Total draft of box. 19. Carrier drafts and setting. 2. Speed of spindles. 3. Twist. 4. Draft gauge point.” 5. Twist "gauge point." The theory of carrier setting cannot be gone into here, but it should be firmly kept in mind that the wool is always running at one of two speeds-back roller 202
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