When a lag is in gear without any pegs, none of the latches touch the knives, and there is consequently no raising of the healds. If all the holes be pegged, one end of each lever is raised, the other end depressed, and consequently all the latches drop on the knives; at the next stroke of which all the healds will be lifted.
By pegging a few of the holes, say the 1st, 3rd, and 10th, we should find only those three healds lifted; in this manner any desired working of the healds may be obtained. The lattice is made up of lags, each of which suffices for two picks, and as the barrel of the dobby will not hold less than 8 lags, a pattern of 16 picks or more is required, unless a smaller pattern be repeated.
In pegging, the lags are placed so that the lattice stands as in the machine, thus:—
FIG. 49.
Numbers 1 to 10 indicate the picks; L 1 to L 5 indicate the lags.
In a left-hand machine the numbers here given ([Fig. 49]) represent the order of the picks, the lattice when in use moving over to the left. B indicates the peg-hole for the back-jack, the front or first jack being at A, and the other holes ranging between; there are two rows of holes on each lag, each equal to 1 pick.
Taking [Fig. 37], showing lifting plan which occupies 5 healds and 8 picks, the pegging for this dobby will be as under, the small number indicating where the peg is placed and which jack is lifted, the picks being also indicated:—