213 (#285) ############################################ CHAPTER VIII THE STUDY OF THE VARIOUS TYPES OF WORSTED DRAWING MACHINES THE comparative method of study is here so much to be preferred that no apology is offered for not treating each type of box, with all its details, separately. Vol- umes might be filled with details of drawing machines, but such would only lead to confusion. The critical study of all worsted drawing machines may best be undertaken under the usual simple scheme already employed, viz. :- (a) Creels and sliver feeding appliances ; (6) Passage through the machine mechanisms; and (c) Delivery mechanisms. (a) Creels and Sliver Feeding Appliances.-Slivers may be fed into machines (a) positively, as in the case of the woollen mule ; or (b) by being drawn in from either cans or bobbins or staves, this being the usual method employed in worsted drawing and spinning. For delicate untwisted slivers, positive surface de- livery or drawing-in from delicately balanced bobbins, staves or balls must be adopted. As a rule it will be found that to obtain a satisfactory delivery from a worsted drawing or spinning frame is more difficult than to obtain a satisfactory feed. It is nevertheless most important that there should be no straining of the slivers during the feeding, since irregu- 213
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