108 (#162) ############################################ WOOLLEN AND WORSTED SPINNING Thus the spindle revolution during the drafting process has the twofold object of supporting the fibres by means of the twist inserted, and of effecting this periodicity in the drafting.* There is here obviously a remarkably interesting mathematical computation and research to be undertaken. With reference to what happens during “piecening," it seems strange that this operation should be done prob- ably millions of times a day in Yorkshire alone and yet of all the pieceners employed apparently few have yet asked the question—“What is happening just under or between my fingers ? ” (Fig. 36). Does not this show the deadening effect rather than the vivifying 1" Fig. 36.- Illustrating "piecening" on the mule effect of our modern system of education ? Certainly the fibre movement in woollen yarn spinning is worthy of more careful consideration than has yet been given to it. Such consideration should take the form of investigations by direct observation, and, aided say by high-speed observation photography, followed by careful and close imaginative thinking. There is far too much parrot-like assertion along with the application of sup- posed common sense to the problems under con- sideration, and the results attained are usually by no means above suspicion. * * (b) Draft and Twist in Mule Spinning.-Although the difference between woollen and worsted yarn is primarily one of fibre arrangement, it should never be * The value of this periodicity as against a steady draw is worth debating. 108
9 9 Textile Machine Part
121 121 Textile Machine
216 216 Textile Machine