152 (#208) ############################################ WOOLLEN AND WORSTED SPINNING cedure here will be exactly the same as for the frame, based upon i skein, viz. : – 1. Calculate theoretical production ; 2. Reduce (or increase) production according to the skeins change ; 3. Reduce (or increase) production according to the twist change ; 4. Modify results 2 and 3 combined according to the relative times of actual spinning and doffing for the respective counts and twist. 1. For I skein (Yorkshire) 3 X 2 X 60 I skein x 256 = 1.4 lb. per hour per spindle. 2. On similar lines the calculations for 5, 10, 20, 40 and 80 skeins have been worked out for skeins change only, and the results plotted (Fig. 49 (a)). 3. But this is on the supposition that the extra twist required for the increasingly fine skeins can be obtained by extra spindle-speed, and this is only so up to about 20 skeins, when owing to the limit of spindle- speed having been reached the carriage must remain out longer during the "double-speed ” period. To illustrate the influence of twist only the following calculations are made on the supposition that in spinning i skein the spindles are running at their maximum speed with the carriage making 3 draws per minute :- For 1 skein (Yorkshire) 3 X 2 X 60 = I'4 lb. per hour 256 per spindle. For 5 skeins (Yorkshire) 3 X 2 x 60 x 2 (turns per i in. for 1 skein) = .62*lb. 256 x 45 (turns per i in. for 5 skeins) per hour. * Not strictly correct because spindle-speed is not effective during the running-in of the carriage. Thus if the time taken is t of a period for outward-draw and 7 of a period for inward-run, then t of 45 2 152
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