2. With a pin separate the interlacing threads of the cloth which are called warp and filling. Warp is composed of yarn running in the direction of the length of the cloth. Filling is composed of yarn running at right angles to the warp.
a. What are the interlacing threads of cloth called?
b. Of what is warp composed and in what direction do the warp threads extend? filling?
3. Notice the appearance of the individual threads (called yarn) of the warp and filling. Test the strength of the yarn by trying to break it.
4. Untwist one of the warp threads and one of the filling threads. Notice whether the yarn becomes stronger or weaker as it is untwisted. What effect has twist on the yarn?
5. After untwisting one of the threads what remains? Measure the length of several of these ends called fibers. Describe the appearance of the fiber as to curl, feel, fineness, etc.
Questions
1. Of what does yarn consist?
2. What causes the fibers to cling together?
3. What is the process called by which two sets of threads interlace?