208 (#279) ############################################ WORSTED DRAWING MACHINES . . . Fig. 62 is a plan of the first drawing-box as con- structed by Messrs. Platt Bros., Oldham. As the calcu- lations for such a box are fully given when dealing with the finisher-box the following particulars only are given here, and these may, of course, be verified by calcula- tions based on the figures given on the plan. Ist Draft: carrier on back roller I 03 2nd Draft : porcupine on carrier I•036 3rd Draft: front roller on porcupine 3.909 4th total draft: I•03 X 1.036 X 3.909 = 4:17 The surface speeds for one revolution of the main shaft are- I. Back roller 0142 2. Carrier •01464 3. Porcupine 01517 4. Front rollers •0593 5. Rubbing leathers · *057 6. Winding-on : .056 These figures are interesting as illustrating the various tensions desirable in the meches as they pass through this type of box. In Fig. 63 the plan of a finisher French drawing- box is given, from which the following details may readily be studied Surface speeds for I revolution of the main shaft : 98 x 55 x 38 x 40 x ot 1. Back rollers : 0191 metre. 100 X II2 X 120 X 1000 98 x 55 x 38 x 40 X 40 X 2. Ist carrier : 100 X 112 X 120 X 38 X 1000 •0196 metre. 98 x 55 x 38 x 40 x 27 x tt 3. 2nd carrier : •016 metre. IOO X II2 X 120 X 31 X 1000 98 x 55 x 38 x 31 x 49 x 38 x * 4. Porcupine : 100 X II2 X 120 X 102 X 26 X 1000 =*0104 metre. . 209
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