Effect B is repeated four times in the design, or in each division. By having two divisions for the illustration we find that to produce the necessary repeats in the design each hook of rows 17 to 21, inclusive, requires 8 harness-cords to each leash.
Effect C repeats twice in one pattern or one division. Having two divisions for the illustration, each hook of row 22, including row 34, requires 4 harness-cords to each leash.
Effect D repeats once in pattern, once in division. This will give a result similar to A, two divisions, row 35, including row 50, with two harness-cords to each leash. This tie-up illustrates the first row of every effect, and also the last leash, 400.
Adding the number of warp-threads in the full repeat of the pattern, we have:
| Effect A = | 128 threads. |
| Effect B = | 40 threads. |
| Effect C = | 104 threads. |
| Effect B = | 40 threads. |
| Effect D = | 128 threads. |
| Effect B = | 40 threads. |
| Effect C = | 104 threads. |
| Effect B = | 40 threads. |
| ---- | |
| 624 threads. |
Or, in other words, we are producing with a “straight-through tie-up for repeated effects” on a 400 Jacquard machine, a design, which would require a 600 machine on a common straight-through tie-up, including the two reserve rows, or 624 needles; in other words, a saving is made of 224 needles in one full repeat of the pattern.
In designing for looms tied up for similar styles, the repeats of effects must be kept in mind. The general style of every design may be changed, but the arrangement of the repeated effects cannot be altered without changing the entire Jacquard harness.
III. Straight-Through Tie-up of a Jacquard Loom having Front Harness Attached.
As mentioned in the beginning of this work, every Jacquard machine contains two reserve rows, which may be used for various purposes. One of the purposes to which these rows are frequently put is the enlargement of the design of the fabric by using harness on the front of the comber-board, technically known as “front harness.” For example, in damask table-cloths, we may use the Jacquard harness for producing the border of the fabric. The centre part may be produced with front harness, forming a checkerboard, or some similar effect. This process may be reversed by designing the centre of the table-cloth for the Jacquard harness, and the border for the front harness.