194 (#259) ############################################ WORSTED DRAWING MACHINES 1 ( = 35 35) = Therefore if this be taken as the G.P. the calculation stands- Draft G.P. Change wheel, and change wheel x G.P. =Draft. 6.26 and (35 X :179 = 6•26) •179 This is an interesting example of the use of reciprocals which should be thoroughly apprehended ; and then one or other of the two possible G.P.s always employed. The following are the calculations for all the speeds and drafts directly from the pulley shaft (40 wheel) : Back Roller : 40 X 17 X 23 X 50 X 22 70 x 65 x 70 x 7 x 1000 = .0077 of a metre. Fallers : 40 X 25 X II =.00873 of a metre. 70 X 18 X 1000 Front Rollers : 40 X 35 X 50 X 22 =.0483 of a metre. 70 x 65 x 7 X 1000 Winding-on : 40 X 35 X 22 X 22 X 100 X 22 =·0298 of a metre. 70 X 65 X 25 X 40 X 7 X 1000 Front Roller Speed .0483 Front Draft Faller Speed 00873 = 5:53 Back Draft Faller Speed .00873 = I'13 Back Roller Speed 0077 Front Roller Speed 0483 Total Draft 6•27 Back Roller Speed 0077 For any given or suitable speed of the pulley shaft there will be no difficulty in calculating (a) Take-in of back rollers in metres ; (6) speed of fallers in metres traversed or in fallers per minute ; (c) delivery of front rollers in metres per minute. 195
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