The Jacquard Machine Analyzed and Explained / With an appendix on the preparation of jacquard cards, and practical hints to learners of jacquard designing

by E. A. Posselt

Selection of Designing Paper for Two-ply Ingrain Carpets.

Always observe the proportion existing between the number of warp and filling-threads. For instance, take a carpet having 1072 ends warp (536 ground and 536 filling) per yard, with 30 picks per inch (1 pick ground and 1 pick filling, or 15 pair). Then, 1072 ÷ 36 = 29-28/36 ends of warp per inch. The proposition is as 29-28/36: 30; or, what is practically the same, 30: 30, showing that the paper must be equally divided, and 8 × 8 may be used, as is usually done.

Again, take a carpet having 832 ends warp (416 ground, 416 figure) per yard with 20 picks per inch (1 pick ground, 1 pick figure, or 10 pair). Then 832 ÷ 36 = 23-4/36, and the proportion is as 23-1/9: 20, or as 7-19/27: 6-2/3, practically 8: 7; and 8 × 7 paper may be used.

Note.—It will always be advantageous for the card stamping if the designing paper be selected so that the number of warp-ends in one square equals the number of griffe-bars used in the Jacquard machine.