In the weft calculation, the picks per inch multiplied by the width in the reed in inches gives the inches of weft in one inch of cloth. This multiplied by 36 will give the inches of weft in one yard of cloth, and divided by 36, this gives the yards of weft in one yard of cloth. The two 36’s may be left out, as it is obvious that the yards of weft in a yard of cloth are the same as the inches of weft in an inch of cloth. The formula to calculate the weight of warp in a piece is as follows:—
Inches in reed × length of warp in yards × ends per inch in reed840 × counts
= weight of warp.
The formula for the weft is—
Inches in reed × length of piece in yards × picks per inch840 × counts
= weight of weft.
Working out the previous calculation in this manner, we get—
30 × 95 × 70840 × 30 = 7 lbs. 14⅔ oz. of warp.
30 × 90 × 80840 × 40 = 6 lbs. 66⁄7 oz. of weft.
If it is required to find the number of hanks, it is only necessary to leave out the counts in the above formulæ. Thus we get—
Inches wide × length × ends per inch840 = hanks,
and using the figures in the previous example—