193 (#255) ############################################ WORSTED DRAWING MACHINES 1. The Gill-box.-The careful study of the pre paring gill-boxes, strong gill-boxes and finisher gill- boxes (" Wool Carding and Combing," p. 200) will have cleared the way for here studying just those special points which the worsted drawer must perfectly apprehend. Gill-boxes may be studied under the following heads :- (a) Ordinary gill-boxes; (6) Extraordinary gill-boxes, these being 1. Expanding screw-thread gill-boxes ; 2. Double sets of fallers gill-boxes; 3. Double or treble thread gill-boxes ; 4. The O.P.S. gill-box; and 5. The intersecting gill-box. To illustrate the ordinary gill-box in a multiple form Fig. 56 is given. In this figure, four heads economically controlled are shown, the following calculations being arranged to illustrate clearly without further details the principles of driving and calculation involved. Total Draft : Surface speed of front rollers : 50 m/m x 35 x 65 x 70 = 6.26 Surface speed of back rollers : 50 m/m x 65 x 17 x 23 Back Draft : Speed of Fallers 70 x 65 x 25 x 11 m/m Surface speed of back rollers : 50 m/m x tt x 23 x 17 x 18 = I'13 Front Draft : Surface speed of front rollers : 50 m/m x + x 35 x 18 Speed of Fallers : 65 x 25 x 11 m/m 5:54 Total Draft : I.13 X 5:54 = 6.26 It will be useful to calculate the gauge-point so that either N 193
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