282 (#368) ############################################ WOOLLEN AND WORSTED SPINNING the difference in control of bobbin between open and cone drawing. The necessary particulars are included in the following: f 4. The Relative Output, Floor Space, Power Con- sumption and Cost of Typical Sets of Machines.- Here there are so many possibilities of variation that one or two typical cases only may be considered. The most typical case will be that of a set of open drawing to work a typical 60's Botany top (say, 4 oz. per 10 yd.), the yarn required being anything from 1/20's to 1/48's with the corresponding twofold yarn. If the set is likely to be required for mixing several qualities in the grey or several differently coloured tops, three gilling operations will be required, viz.- Can Gill-box; Can Gill-box; 2-spindle Gill-box. The three gilling operations will be followed by seven drawing operations. The first of these drawing-boxes may be either a 2-, 4-, or 6-spindle drawing-box. Now although the 2-spindle box is made, a 6-spindle box is so obviously more economical that, in this case, this is made the basis of the set. The problem must now be faced of adjusting the production of (a) the preceding Gill-boxes and (b) the succeeding drawing-boxes to this "base-unit." To do this the following details are necessary (see List XIV, p. 281) The foregoing particulars should be carefully scru- tinized in the light of what has already been advanced. The effects of increasing or decreasing the number of doublings should be actually worked out and the results tabulated for future reference. Doffing and cleaning, etc., time should also be considered. Thus 282
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