124 (#178) ############################################ WOOLLEN AND WORSTED SPINNING ing the yarn as it is exactly guided by the faller-wire on to the cop or bobbin ; (g) running-in of the carriage to deliver the lengths of yarn spun to the cop or bobbin ; (h) the faller-wire traverse as controlled by the bowl on the copping or shaping-rail, and the turning of the spindles as controlled by the quadrant as the carriage runs in; these con- jointly building up firm, regularly-tensioned cops or bobbins. The greatest periodic change has now to take place for the re-starting of the cycle of movements. The perfect control of all these movements, and certain subsidiary movements not referred to in the foregoing outline, necessitates a truly wonderful com- bination of mechanisms, one mechanism, as it were, controlling the other, and the whole working harmoni- ously together for a common purpose. Such mechanism to be fully described would require a work larger than this to itself * ; here the treatment is limited to just those points which will enable the student or mill manager to intelligently grasp what is happening as he sees the mule, with almost human-like skill, per- forming its task, cycle by cycle. (a) The delivery of the length of condensed sliver to be spun at each draw of the carriage is effected by the revolution of the delivery rollers, in conjunction with the positive turning of the condenser bobbin by means of the surface-contact (by weight) between the actual condensed slivers and the drums upon which these slivers rest or friction. The control of the length of sliver delivered for each draw (and consequently of the spindle-draft or extension) resides in the stop-projec- • See “ Traité pratique de Filature de la Laine Cardée," par Priault and Thomas. 124 1
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