163 (#219) ############################################ RING TWISTING If the doffers are of the simple type the top doffer will take, say, the tan and the bottom doffer the French- grey stripe fairly exactly. To produce the variegated random effect required : (a) The rings on the doffers must be waved so that they encroach upon more than one of the stripes presented to them; or better still (6) Both ring doffers, clothed with ordinary rings, may be given a side-ways traverse so that they doff” the swift partly from one coloured stripe and partly from the other coloured stripe. This arrangement is so simple that it is frequently employed in mills spinning hosiery yarns, and would no doubt prove very efficient for mills spinning the simpler fancy yarns for the costume and mantle trades. The Ring Twisting Frame.The ordinary prin- ciples of ring spinning are usually employed for twisting woollen yarns, see Chapter IX, p. 244, but the following points should be specially considered :- 1. Woollen yarns usually being thick as compared with worsted yarns, the frame should be strongly built and all the parts on the heavy side. 2. Pitch of spindles, size of rings and length of tension should be arranged for the largest possible bobbin or tube. The range of counts to be twisted should be carefully borne in mind. 3. All additions such as for clouding, knopping, etc., should be strongly built yet delicately balanced. 263
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