89 (#139) ############################################# CARDING AND CONDENSING multiple or series tape machine (Fig. 20a), but it is conceivable that it might be so improved that it would be at least equal in efficiency to the single tape machine. In Fig. 21a a method of tape control different from those illustrated in Figs. 20 or 20a is shown. This also illustrates the method of running the condensed slivers on to six instead of two or four condensing tiers. Careful study of these diagrams will bring out the following questions : (a) Method of doffing the film--comb or stripper ; (6) Continuous or single tapes ; (c) Deep grooved (Fig. 20a) or shallow grooved (Fig. 21a) tape control; (d) The turning over of the tapes in order- I. to deliver the films of wool they carry to the rollers; 2. to use both sides as film carriers ; (e) the guiding of the tapes to obviate two tapes, with their accompanying air currents, running against one another and so disturbing the delicate films of wool at the crucial moment of presentation to the rubbers; (f) the number of tiers of rubbers and condensing bobbins will depend upon the width of the tapes (i.e. number of threads taken off the machine). If, for example, 60 threads are taken off 60 in., two tiers may be ample; but if 180 threads are to be taken off 60 in., then the delivery illustrated in Fig. 21 should be employed. (g) single or tandem rubbers and breadth of "rub." Several patents have been taken out for steel blade condensers. The employment of steel bands or tapes is also now possibly thinkable. This brings up the question of the material of which the condensing tapes are made. It is obvious that such materials 89
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