149 (#205) ############################################ WOOLLEN FRAME SPINNING This frame probably does not represent the last word on this problem, but it represents the most im- portant step taken so far in the solution of the fascinating basic problem here involved. In Fig. 47 other forms of “ twizzle " which have been tried on the Continent are illustrated, The Drury Direct Spinning Frame. This was an attachment to the condenser, and, as a consequence, its output was limited to the output of the card. Briefly it consisted of two endless bands between which twist was supposed to be rubbed into the condensed sliver. A " free-end" was supposed to be obtained by means of a needle-point acting with the rubbing-bands just as the sliver left the rings of the doffer. The yarn pro- duced on this frame, however, was so weak that it was obvious that very little twist was ever inserted. Yarns up to 1,500 yd. to the lb. were said to be satisfactorily produced on this frame. Perhaps the criticism should also be suggested that at the best the product was only a“ twisted condensed sliver” and not a spun thread." Relative Production of Platt's Frame and Mule with Respective Costings. The following calculations and the graphs (Figs. 48 to 51) give the bases of calcula- tion for both productions and costings. For the frame the calculation for production is very simple. If the spindles run at 3,000 revolutions per minute and a twist angle of 25° (2 turns per 1 in. for I skein) be taken as a basis for twist throughout, then the calculation stands :- For i skein (Yorkshire) . 3,000 X 60 2 X 36 X I X 256 per spindle per hour. This calculation is exceedingly simple and will cause no one any trouble. But this is the calculation for I skein only. Apply the principle of exaggeration and 9.76 lb. 149
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