75
22500)
450000
(20 picks per quarter-inch
45000
0
When the cloth is taken out of the loom, rather more than this number of picks will be counted, as there is not the same tension as when the cloth is being woven. It is usual to allow about 1½ per cent. for this shrinkage.
For the purpose of easy calculation the dividend of the loom is obtained; that is, the change wheel required to give one pick per quarter-inch. By using this as a dividend and dividing by the number of picks required in a quarter-inch, the quotient will be the change wheel required; and, vice versâ, by dividing by the change wheel, the number of picks given by that wheel can be obtained.
To find the dividend of a loom—
Multiply the rack, stud, and beam wheel together for a dividend, and the stud pinion and the number of quarter-inches in a circumference of the emery beam for a divisor, and the quotient will be the mathematical dividend. Add 1½ per cent. to this for the practical dividend.