232 (#304) ############################################ WOOLLEN AND WORSTED SPINNING to cling together being altogether outweighed by the doubling of the strength of the sliver which traverses the ball during formation and must serve for the pulling of the ball round during the feed into the succeeding box. In the following list comparative particulars of drawing sets for Open, Cone, and French drawing are given- CONTRASTING OPEN, CONE, AND FRENCH * DRAWING PLANTS Type of Machine turned off Drams Weight Total Capital Space Cost of H.P. Cost of OCCU- Build per weekt Roving Machines 1 pied ings I quired te- sq. ft. Open Drawing 4,500 lb. Cone French 4,500 lb. 3,920 lb. 3.5 3.5 5.2 £1,120 £1,950 £1,620 1:496 £305 1,450 £296 1,453 £295 20 27 16 In Fig. 67 are given tracings of Tachograph Records illustrating speed variations in the several types of drawing and spinning machines. Irregularities, as in the case of the mule, are inevitable, but strong endeavour should be made to reduce such variations to a minimum. The reading of what these irregularities mean is very interesting and if successfully achieved may lead to marked improvements in the running of plants. In reading this chapter the worsted drawer will perhaps feel too much is left undecided or even unstated. The truth is that there has been issued too much merely descriptive information; this work and particularly this chapter is a protest against merely rule-of-thumb methods and a plea for the scientific investigation into the many problems here only too casually treated. * Originally appearing in “ The Textile Mercury." † 55$ hours. Pre-war costs. 232
141 144 Textile Machine
152 152 Textile Machine
44 44 Textile Machine