138 (#192) ############################################ WOOLLEN AND WORSTED SPINNING described in the foregoing pages. By means of a cone arrangement this is effected without the use of change wheels; 6. In the spinning of blends which “bind " quickly a spindle stop motion to stop the spindles until the carriage has gone a short distance away from the rollers is added ; 7. The nosing motion is very important. Improve- ments in this are usually worth consideration, as it is by no means uncommon for yarns to be spoilt by being " nosed” on both the woollen and worsted mules ; 8. A motion for stopping the mule in any desirable position is useful ; 9. Squaring bands and rigid carriage control to ensure perfect spinning should receive careful attention ; 10. The drawing-out scroll design should be in accord- Cance with the variable speed of carriage defined on pp. 118 to 120. The running-in and steady- ing scrolls design should probably partake of a pure harmonic character for both absence of “jar" and economy in power consumption. Reference to mule makers' catalogues usually reveals attachments of which each particular firm has made a speciality. Calculations for Draft, Drafting-Twist and Twist.- These calculations are comparatively simple, and in this brief treatment in their entirety must necessarily be excluded. It will probably be sufficient to note- 1. That the draft is dependent upon the position of the slubbing peg, which disengages the delivery rollers from the power ; 138
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