The comber-board, _a_, _b_, _c_, _d_, is divided into two equal parts, _S_ and _H_. Each part containing the harness-cord for one machine only. The drawing of the tie-up is arranged for two divisions, and also readily explains any tie-up for more divisions.
The leasing of the Jacquard harness, _K_, is arranged (as illustrated in the drawing by leash-rods _p_ and _r_) to commence as follows:
1st end: harness-cord fastened to No. 1 needle of machine, _S_; 2d end to No. 1º needle of machine, _H_; 3d end to No. 2 needle of machine, _S_; 4th end to No. 2º needle of machine, _H_; 5th end to No. 3 needle of machine, _S_; 6th end to No. 3º needle of machine, _H_; 7th end to No. 4 needle of machine, _S_; 8th end to No. 4º needle of machine, _H_.
These eight ends, forming the first complete row of the comber-board, will use the first row of both machines; the second row of the comber-board will use the second row of both machines; and so on, until every row of the comber-board, with corresponding row of the Jacquard machine, is taken up. In the drawing we have indicated, as usual, besides the first row, the last row of the machine and the comber-board; or, in other words, we show the threading of
Warp end 193: harness-cord fastened to No. 97 needle of harness _S_. " 194: " " " 97º " " _H_. " 195: " " " 98 " " _S_. " 196: " " " 98º " " _H_. " 197: " " " 99 " " _S_. " 198: " " " 99º " " _H_. " 199: " " " 100 " " _S_. " 200: " " " 100º " " _H_.
This method of using two Jacquard machines, on the principle explained, is employed on Jacquard looms for dressgoods figured with an extra warp, on upholstery goods, and similar textile fabrics.
Fig. LVII. shows a fabric design for a curtain, to be executed on the straight-through tie-up in two sections.
_C.--Using one machine and one comber-board: the machine unequally divided and the comber-board equally divided._
To explain, take the regular upholstery fabric tie-up known as “petty point,” on a 600 machine 12 rows in depth. 600 ÷ 12 = 50 + 2 rows reserve = 52 rows in width. We find used--
1 row for selvedge. 10 rows for binders (_B_). 41 rows for figure (_A_). -- 52 rows.
41 (rows figure) × 12 (needles for one row) = 492 needles to be used for figure.