115 (#169) ############################################ WOOLLEN YARN SPINNING I 60 X 5 6° 60 60 X •75 Cot. 0 14.6 and Cot. -10 3:14 3:14 X *75 4° 2nd Example : Should the blend be composed of fibres up to, say, 2 in., then- 60 X 2 Cot. 0 38 and Cot. -10= 1•75° 3:14 3rd Example : Should the blend be composed of fibres up to, say, '5 in., then Cot. 0 9.5 and Cot. -10 3:14 4th Example : Řequired the angle of drafting-twist for spinning a blend the fibre-length of which is 1 in. and the condensed sliver of which is io skeins (10 yd. per dram). Cot. 0 43 X I 43 = 13:5 and Cot. - 10 4° 3.1416 3.1416 Of course, to apply this rule it is again necessary to obtain the length of the fibres comprising a blend- this may be actually ascertained mechanically * or may be carefully estimated by the spinner as already noted. If " turns per inch” (T) only are required, then- ) Ist Example : It L = 1.3 turns per i in.; •75 2nd Example : L 0.5 turns per 1 in. ; I I I 2 * By the Schlumberger Top Tester or by Dr. Laurence Ball's machine. In the case of thick slivers this formula must stand as =T I Ju-( L x -). D And in this case ♡ yds. per lb. may not give D. (See p. 295.) 115
201 203 Textile Machine
206 209 Textile Machine