| 16 × 10 | 160 | ||
| = | = 26⅔ Ans. | ||
| 16 - 10 | 6 |
Example 40.—40's and 30's worsted are yarns in stock, find a third thread to fold with these to make a three-fold counts = 10's.
| 40 × 30 | 40 × 30 | ||
| = | = 17⅐ counts of the two yarns folded. | ||
| 40 + 30 | 70 |
Using the difference rule—
| 17⅐ × 10 | |
| = 24's Ans. | |
| 17⅐ - 10 |
To provide proof use the ordinary method of folding—
| 40 ÷ 40 | = 1 | lb. |
| 40 ÷ 30 | = 1⅓ | lb. |
| 40 ÷ 24 | = 1⅔ | lb. |
| 40 hanks | = 4 | lb. |
40 ÷ 4 = 10's counts.
If the third thread were wanted in another quality such as cotton, the answer would be secured by transfer—
| 24 × 560 | |
| = 16's cotton | |
| 840 |