With the wheels given in [Fig. 71] the dividend will be as follows:—
| 15 | stud pinion | |
| 60 | quarter-inches in circumference of beam | |
| 900 | ||
| 50 | rack wheel | |
| 120 | stud wheel | |
| 6000 | ||
| 75 | beam wheel | |
| 900) | 450000 | (500 mathematical dividend |
| 4500 | ||
| 00 | ||
| 500 | ||
| 7 = 1½ per cent. for shrinkage | ||
| 507 practical dividend. | ||
Having the dividend, it is only necessary to divide by the picks to obtain the change wheel required, or to divide by the teeth in the change wheel to obtain the picks which it will give, thus—
| picks | 507 | = 39 change wheel change wheel | 507 | = 25⅓ picks. |
| 13 | 20 |
The following are the wheels used by various loom makers:
Rack wheel.
Stud wheel.
Stud pinion.
Beam wheel.