146 : 100
If the reed used is one with 33½ dents per inch and the satin is four ends in a dent, there will be 33½ × 4 = 134 ends per inch in the satin; and if there are to be 100 picks per inch in the cloth, the paper required to keep the figure proportionate would be for a 400’s machine, 134 : 100
Therefore the paper required is 8 × 6.
It is not at all necessary to use point paper ruled exactly in proportion to the warp and weft, as the design can easily be elongated or otherwise. It is only necessary to rule the sketch into squares, representing a certain number of ends and picks, and to mark off the point paper accordingly.
Designs for Split Harness.—In designing for the split harness, [Fig. 124], no ground dots are required on the design, as the shafts under the comber-board which are lifted by the spare hooks weave the ground pattern. The design is simply coloured in, and the binding dots put on the figure only.
In a double-scale split harness every hook lifted takes up two ends, and thus the bindings in the figure will appear in twos, and will therefore appear rather coarse. In the ground every end is woven separately by the shafts, and these will require to be lifted to give the required ground weave. All that is required, therefore, is to put the lifting dots on the point paper in the position required to operate the hooks which lift the shafts. Except for the limit with regard to the ground weave, designs for the split harness are prepared in the same manner as for an ordinary harness.
Pressure Harness Designs.—In designs for the pressure harness no binding dots are required on the point paper in either the figure or ground, as the shafts or “pressure healds” in front of the harness do all the binding.
This harness is chiefly used in fine goods. Several warp threads are drawn through each mail in the harness, and afterwards woven singly by the pressure healds in front.