On six ends we have seen that nine simple twills can be made, and as each may be combined with the others in six different positions, the number of patterns which can be obtained from this system of combination is as follows:—[Fig. 186] combined with each of the others in one position each gives eight patterns, and as there are six positions in which they can be combined, this gives forty-eight patterns. [Fig. 187] combined with Figs. [188] to [194] gives seven patterns, and these in six positions give forty-two patterns. [Fig. 188] combined with Figs. [189] to [194] gives six patterns, and in the six positions give thirty-six patterns. By going through all the changes in this manner we get successively 48, 42, 36, 30, 24, 18, 12, and 6, or a total of 216 patterns. In addition to these, each twill may be combined pick and pick with itself in four different positions without giving double picks.
FIG. 214.
FIG. 215.
FIG. 216.
FIG. 217.
