| 100 × 15 × 840 | |
| = 535·7 yd. | |
| 21 × 64 × 1·75 |
Example 23.—Find the length of rib fabric with a take-up of 3 obtained from 100 lb. of 20/20 Scotch woollen counts, 15 courses per inch, 60 in. wide.
| 100 × 10 × 200 | |
| = 74 yd. | |
| 15 × 60 × 3 |
Example 24.—Find the width at which a fabric will require to be worked to use 80 lb. of 2/16's worsted counts, take-up 2½, length 240 yd., 18 courses per inch.
This formula is identical to that used to find the length, except that the length is substituted for the width—
| weight × counts × basis | |
| = width. | |
| courses × length × take-up |
| 80 × 8 × 560 | |
| = 33·19 in. wide. | |
| 18 × 240 × 2½ |
Example 25.—Find the width for a cotton fabric weighing 40 lb., 120 yd., 2/32's counts, 21 courses per inch, take-up is 2½.
| 40 × 16 × 840 | |
| = 85·3 in. wide. | |
| 21 × 120 × 2½ |
Example 26.—Find the courses per inch required for a fabric worked in 18 skeins, 60 in. wide, take-up 175, 120 yd., 50 lb. weight. This is obtained from the same formula as Examples 24 and 25 except that the width is substituted for courses per inch.