Intersections per inch =
120
4
70)
480
(66⁄7 per cent. contraction.
420
60
In a plain cloth the warp intersects every pick, and so the intersections per inch are the same as the ends per inch. In a “two and two” twill the warp intersects twice in four picks, and the intersections per inch will be one-half the picks.
In more medium cloths the multiplier 3 is used; as, for example:—