. The principles and processes of cotton yarn manufacture. e sharp edge of the mote knives, they are deflected and fall down throughthe spaces to the floor. As the space between the edges of the knives andthe licker-in teeth is very small, leaf, broken seed, etc., which do cling to CARDING 55 the fibre, being longer than the space, are scraped off by the knives, andfall between them. It is at this point, therefore, that the majority of theheavy impurities in the lap are removed. Some long fibres loosely heldare thrown through the interstices, but their number is very small. Placed directly in
. The principles and processes of cotton yarn manufacture. e sharp edge of the mote knives, they are deflected and fall down throughthe spaces to the floor. As the space between the edges of the knives andthe licker-in teeth is very small, leaf, broken seed, etc., which do cling to CARDING 55 the fibre, being longer than the space, are scraped off by the knives, andfall between them. It is at this point, therefore, that the majority of theheavy impurities in the lap are removed. Some long fibres loosely heldare thrown through the interstices, but their number is very small. Placed directly in front of the mote knives in a curve conforming tothe surface of the licker-in, is a tin arrangement called a screen or undercasing. In it are small spaces between the grids B through whichshort loose fibres may be thrown on to the floor beneath. It is set verynear the licker-in surface, and has the duty, first, of preventing fibres frombeing thrown away from the licker-in and becoming waste; and, second,of allowing shorter fibres and dust to be cast Fig. 35- This licker-in screen is bolted at c^* and c-*^ to a similar one C^under the main cylinder. A view in perspective of the screen is shown at Fig. 35- B, Fig. 34, is a cover over the licker-in. B is a small rod coveredwith flannel, called a clearer roll, and is used to collect fl}^ which maycome through the space between B^ and B. B^ is a wedge-shaped pieceof wood covered with flannel and is also a clearer. The cotton which clings to the licker-in teeth is carried through i8o°and then entirely removed by the action of the teeth on the cylinder. The cylinder is a large cylindrical shell about 50 inches in diameter. Itis commonly cast in one piece, sometimes in two and bolted together. Itis strengthened by longitudinal and transverse ribs, and has fitted into itsends eight armed spiders, to be seen in Fig. 33. Through these a 56 COTTON YARN MANUFACTURE cast-iron shaft is placed; the means used for holding it firmly to th
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