199 (#265) ############################################ WORSTED DRAWING MACHINES For a draft of 7.59 for one revolution of back shaft, therefore -1519 = 6-7 sections (or teeth) change wheel for no draft, , I X 7.59 teeth per section and * 50 change wheel •1519 Now .1519 is the reciprocal of 6.7 I 50) = '1519 6.7 Therefore if this be taken as the G.P. the calculation stands- Draft G.P. Change wheel and change wheel x G.P. = Draft. 7:59 and (50 x •1519 = 7.59) •1519 This corresponds with the example given on p. 194. It should be noted here that it is usually necessary to check calculations similar to this by direct experi- ment. In the case of this particular box owing to slight differences the G.P. is 106. As illustrating the difference that this makes 50 X •106 = 5.3 Draft There are three specially interesting features in this box 1. The front rollers are extraordinarily small, thus favouring the control and satisfactory treat- ment of the shortest wools ; 2. The front rollers are spirally grooved ; 3. The fallers have a half-fall action favouring the reduction of the distance between the wool in the faller and the wool under the control of the front roller to a minimum. A variation of the ordinary gill-box is to be found 199
3 5 Textile Machine
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