203 (#271) ############################################ WORSTED DRAWING MACHINES 1 speed or front roller speed and the carrier should be set and speeded with this firmly in mind.* It should be noted that in the drawing-boxes the limit of production due to limit in spindle speed is reached. It is an interesting question to decide exactly where this takes place. The winding of the sliver on to the bobbin due to the washer-retardation of the bobbin as compared with the speed of the flyer is an interesting operation which should be perfectly visualized. It will thus be realized that the revolutions of the spindle go into (a) the sliver as twist; and (6) coils on the bobbin for winding-on. Thus a sliver may be drawn from a bobbin in three ways I. Straight with bobbin revolving. In this case the twist in the sliver is- Revs. of spindle - coils on bobbin. 2. Off one end when the twist in the sliver is - Revs. of spindle 2 (coils on bobbin). 3. Off the other end when the twist in the sliver is - Revs. of spindle + 2 (coils on bobbin). Knocker-off Motion.--In order to balance up acci- dental differences in the weights of slivers it is necessary to have on certain boxes knocker-off motions which stop the box when a previously decided length of sliver * The musk -ox fibre is again a useful example. It carries long hairs (12 in.) of the outer-coat and as the under-coat fibres are only 6 in., the difficulties of ratching and carrier setting are very great. It is found best to ratch to the longest fibres (12 in.) and put a heavy metal carrier to control the bulk of the fibres at 6 in. 203
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