174 (#236) ############################################ WOOLLEN AND WORSTED SPINNING the principles of working the slivers through French sets of drawing-boxes. The Drawing Mechanism.-The first principles of worsted drawing, then, to be dealt with will have immediate reference to the three types of worsted sliver- preparing boxes, viz. The ordinary gill-box; The ordinary drawing-box; and The porcupine-box (or French drawing-box). In each of these types of machine there will be front-rollers to be run as quickly as possible, in order that as great a weight of sliver as possible may be delivered ; and back-rollers which will be run just so much below the front roller speed that the right draft or extension may be given to the slivers under treatment. In the ordinary gill-box the slivers are supported between the back and front rollers by a series of pinned fallers controlled on the screw-thread principle (see “ Wool Carding and Combing," p. 201). In the ordinary drawing-box the slivers between back and front rollers are supported and in part con- trolled by the carriers, the action of which must be carefully studied. In the case of the French drawing-box the slivers are supported by the porcupine, which may be regarded as a continuous gilling arrangement. It should be remarked here that in the ordinary drawing-box twisted slivers may be treated, but in the gill-box, and in the French drawing-box, twist is un- thinkable and probably impossible. The importance of this limitation will be apparent when English and French methods of sliver treatment come to be con- trasted. 174
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