259 (#337) ############################################ PRINCIPLES AND PRACTICE THE WORSTED MULE If the woollen mule needs a monograph so does the worsted mule. In fact, one has only to take up the astounding publications of some of the Continental firms to realize what amateurish publications are all too frequently issued in this country. The essential difference between the woollen and the worsted mule goes back to the character of the fibre spun on each- short and long respectively. Now the long fibre (and a short worsted fibre is usually long in comparison with a condensed woollen fibre), usually treated on the worsted mule :- (a) Allows of the introduction of roller-draft pre- vious to the spindle and carriage action; and (6) Limits the spindle-draft to a slight "gain ” of the carriage of from 1 in. to 2 in. Perhaps there should here be added - (c) The finest wool yarns-over roo's worsted count -are possibly best spun on the worsted mule, necessitating delicate delivery action and fine adjustments throughout. Everything follows from these three points. Draft- ing rollers are added-their action being controlled from the headstock—their size being such as to control the shortest possible fibres; as no draft-twist is needed there is no double-speed of the spindles, the usual speed of 4,000 to 5,000 revolutions per minute being main- tained throughout the draw; the front rollers deliver throughout the outward movement of the carriage, the arrival of the carriage at the end of its draw is the signal for the backing-off and the running-in ; and if each movement is carefully followed it will be found that easements and mechanical refinements are introduced 259
7 8 Textile Machine
11 12 Textile Machine
19 20 Textile Machine
59 60 Textile Machine
99 100 Textile Machine
115 115 Textile Machine Part
129 129 Textile Machine Part
158 159 Textile Machine
233 233 Textile Machine Part
238 238 Textile Machine Part
113 113 Textile Machine Part
121 121 Textile Machine Part
224 225 Textile Machine Part
174 176 Textile Machine Part