279 (#365) ############################################ SETS OF MACHINES 61" 8.9 5}" 9.8 12.8 9.2 10:2 31" 31" 6 I.1 2.6 1.9 The worsted spinner working exactly in accordance with the principles laid down throughout this work will obtain the following results--- which the practical spinner will usually at once recognize as nothing more nor less than his own practical particulars. List XII Quality 28's | 32's | 36's 40's | 44's *44's 48'u Max. Countst 14's 19's 25's 30's 40's | 34's 36's Av. Fibre Length(Roving) 8" 7" 67" 81" 161" Spinning Draft 8.9 8.5 8.2 Roving (Drs. per 40 yd.). 8.8 6.5 5.4 4.5 4.6 4'2 Quality 50's, 56's , 58's 60's | 64's 70's 80's Max. Countst 38's 45's 52's 54's | 64's ' 76's 100's Av. Fibre Length(Roving) "5" 41" 41" 41" 3 Spinning Draft 7.8 7.5 75 73 6.6 6.4 Roving (Drs. per 40 vd.). 307 2:4 1.5 The above drafts are based upon the formula I + πVF but in many cases as a final spinning draft the formula I+VI may be employed; while for the final draft on the worsted mule the formula 30 F will not prove excessive. The worsted drawer, however, must use his judg- ment in deciding exactly what line to pursue, taking all the factors into account and weighing each. The question now arises—what number of spinning spindles will be required to follow the y roving spindles. This calculation may well be worked out on the theoretical basis already given, and then the theory criticised in the light of practical experience. Taking a 64's quality of material as a basis, the following par- * Carded qualities from here. † The counts are for the finest qualities of the wools in question-- a low 6o's (robo" diat.) will only spin to about 48's (see p. 230). TT 279