204 (#272) ############################################ WOOLLEN AND WORSTED SPINNING has been wound on to each bobbin. The bobbins are then weighed on such a balance as that illustrated in Fig. 60, and as the wood bobbins themselves weigh the same, and the lengths of sliver upon these are the same, any differences there may be are due to irregu- larities in sliver. The bobbins are then balanced up against one another and irregularities thus corrected. It is a matter of opinion how often during the drawing processes this should be done. The same idea may also be applied to gill-boxes so that two types of knocker-off motion are in use, viz. 1. The gill-box knocker-off for shorter lengths of thick slivers; and 2. The drawing-box knocker-off for longer lengths of finer slivers. Each motion includes ingenious features which should be thoroughly studied, the first employing the equivalent of the “hunting tooth” and the latter the advantage of a worm and worm-wheel. 3. The Cone Drawing-box.-As fully explained in the succeeding chapter, the basic difference between the cone and open types of drawing-boxes is in the method adopted of positively controlling the speed of the bobbin (a) to "lead” on the spindle-speed in order to take up exactly the sliver delivered by the front rollers and to obviate possible rupture of sliver; and (6) to change this " lead ” according to the bobbin change in circumference, i.e. to change its number of revolutions as it increases in diameter in order to maintain a constant surface or " taking-up” speed. 204
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