2. Using a pencil as a harness (See Exp. [2]) raise the first thread of each set of warp threads and pass the filling thread through the shed thus formed.
3. With another pencil as a second harness raise the second thread of each set of warp threads and pass the filling.
4. With a third pencil raise the third thread of each set of warp threads and pass the filling.
5. With still another pencil to act as a fourth harness raise the fourth thread of each set and again pass the filling.
6. Repeat the above directions (2 to 5) several times. Notice that the moving of the filling thread, one warp thread to the left, each time it is woven is causing a diagonal line or rib to form, called twill.
7. Cut the woven sample away from the loom and mount.
Questions
1. Why is this weave called a twill weave?
2. How is the diagonal line or twill formed?
3. Why would this kind of weaving be spoken of as 4-harness weave?