COTTON. 121 



Yarns are of at least two well-marked kinds, viz., twist and weft. Twist 

 yarns must be strong, round, and elastic when stretched out in the fingers 

 ofjboth hands ; they form the great bulk of the warp threads used in cotton 

 cloth manufacture. Weft is spun from softer staples of cotton than twist. 

 The staples are of a good colour, either white or brown, as the yarn is 

 required to intersect the warp threads and then float over an interspace of 



Fig. 81. Roving strands. 



other warp threads. The weft thus gives a good face to a cloth, or it gives 

 and takes with the warp, and intersects every thread as the strand of 

 weft yarn is conveyed in the vehicle of cop yarn in the shuttle, which 

 leaves behind a portion of endless weft on the trash board. This is 

 pushed up to the woven cloth by the reed fixed in the sley, and controlled 

 by the rocking-shaft and crank-arms of the power-loom. 



