262 (#342) ############################################ WOOLLEN AND WORSTED SPINNING a are also liable to give rise to irregularities-usually “ repeating "irregularities—unless the greatest care is taken in the dyeing. Almost without exception yarn- dyeing is limited to worsted yarns, although it is evident that twofold woollen yarns might also be so treated. There is a form of cotton weft dyeing (specially employed for gabardines) which should here be noted. The yarn to be employed as weft is made into a warp of such a length that one thread will just fill a weft spool. It is then dyed in the warp form and subse- quently wound on to the weſt spool thread by thread, spool by spool. It is obvious in this case that the utmost care should be taken in dyeing the yarn in this form, since if this is “ended," i.e. if the tail-end of the warp is darker or lighter than the head-end, the piece will be “weft- barred,” for in the cloth the tail-end will finish a bobbin width and the head-end will start a bobbin width, so that tail-end and head-end will come against one another as a straight-edge in the cloth. To avoid this such a warp is usually doubled several times for dyeing treatment. Slubbing-dyed wool (6) will ultimately all be worsted yarns, the wool being dyed after combing,* and the yarn usually re-combed after dyeing.† Until quite recently slubbings have been dyed in the open "hank” form, but to-day many "tops” are dyed in the “top” form. When this latter method is adopted sometimes no second combing is deemed necessary- the tops are passed straight away through the gill- boxes to the drawing-boxes. Re-combing, however, is the usual method adopted in the worsted industry. Wool-dyeing (a) is almost invariably employed in * If dyed before combing too much felting takes place. † There will be small quantities of re-combing (coloured) noils. ( or 262