viii (#12) ############################################ PREFAGE Here, however, the question also arises as to whether the porcupine should be speeded in terms of the back or of the front rollers and further, which is the circum- ference of the porcupine which should be so speeded. A quite different problem, which may be treated in a similar manner, is that of the position of the top carrier roller in a drawing-box or spinning frame. This may be :- Ist, Inclined towards the front rollers ; 2nd, Carried perpendicularly over the lower carrier roller ; or 3rd, Inclined away from the front rollers. Another problem, of more than ordinary interest just at the present moment, is the insertion of twist into two and manifold yarns. This may be effected by :- Ist, Rotating the double or multiple thread carrier ; 2nd, Rotating the twisted thread carrier; or 3rd, Rotating both carriers (Ist and 2nd methods combined). The industry had become so accustomed to the end method that it received a sudden shock when the ist method was adopted in the new “Climax" Twisting and Cheese-winding Frame. This book is specially designed to develop the critical outlook and comprehensive habit of thought illustrated by the foregoing examples. viii
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