194 (#260) ############################################ WOOLLEN AND WORSTED SPINNING The design of box for running a large number of fallers a minute must be carefully studied-if, say, only 100 per minute are required, design of cams, etc., is not so important, but in such a box as the 2-spindle gill where above 300 fallers a minute (= 300 inches moved per minute with 1 in. pitch) may be desirable, every endeavour must be made to obtain perfect control by good design in the parts controlling the fallers or faller-locking " cannot be avoided. The advantage of the circular gill (the porcupine) is here in evidence. The porcupine is frequently run at over 200 in. per minute on its working circumference. * * V. Of the extraordinary gill-boxes, type 1 has never been employed as other than a preparatory gill-box, and owing to its tendency to "faller-mark" the sliver has failed to make good; and type 2 is only found to be useful in the early stages of preparing wool -say for the first two operations in preparing wool for combing by preparing gill-boxes—the lack of control exercised by the fallers over fibre-straightened slivers being obvious in this and even in the single-set of faller gill-boxes (" Wool Carding and Combing," p. 207). The employment of double or treble screw-threads referred to under (3) is worthy of more careful considera- tion, for by this means fallers may be traversed rapidly under good mechanical control, and yet the sliver may be well supported by the necessary number of fallers between back and front rollers. The O.P.S. box referred to under (4) is one of the most interesting recently introduced. In Fig. 57 the plan of a double-head box of this description is given. The calculations for this box may be briefly set out as follows: 196
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