It may be desirable to mention a different method of inserting the tuft yarn. In this case the spool is detached from the chain and made to descend almost straight, turning about 60° out of the vertical towards the back of the loom just as the tubes enter the warp shed. This has the effect of turning the free ends of the tufts somewhat upwards. The spool is then turned again so that the tubes are vertical, and are brought close against the fell of the cloth. The binding weft is then inserted, and the sley comes forward to carry the tufts up against the breast. At this stage, a toothed comb, made in two parts, one working over the other, comes up from below the breast to turn upwards the loose ends of the pile through the warp, one part of the double comb, called the dummy comb, slipping over the other so as to clear any tufts which might be pulled down on to the back. Then the second binding weft is put in, behind the tufts; and at the same time the tufts are cut. There is another beat-up of the sley, and the bottom weft is inserted. This completes the cycle; the warp chains change; and the process is repeated. An alternative fashion of cutting to the double scissor or guillotine knives is sometimes employed, a circular knife in front engaging against a fixed straight knife at the back. This system has the advantage that the knives have not to be kept sharp, though they must be very accurately adjusted. The weft motion is another ingenious piece of mechanism. The weft is inserted in the warp shed by a needle about 5/8 in. in diameter, entering from the right-hand side of the loom. The jute weft is conveyed from a ball, tensioned by suitable springs, and threaded through the eye of the needle. It is obvious that the weft shot must be double, and also that it would not stay in the shed after the withdrawal of the needle, unless it were caught in some way at the left hand of the loom. This is effected by a small shuttle carrying the edge-thread. This shuttle is similar to a sewing machine shuttle, but larger, being about 3 in. long and 1 in. in diameter. It runs backwards and forwards in a semicircular shuttle-race, and is so adjusted that it passes under a notch near the end of the needle, and over a loop of the weft, carrying the edge-thread through the loop, and holding it taut while the needle is receding in such a way as to prevent the weft slipping back, and to make a good selvedge to the carpet. When it is desired to use two different weft threads, the needle has an open eye, or hook near its end, instead of the ordinary eye, and the two wefts in turn are presented to this eye by a rocking eyeletted weft-carrier, so that the needle picks up the weft just before it enters the shed.