SOME COMMON MACHINES 



523 



Exercise 100. A Study of the Chain-stitch Seam and the Lock-stitch Seam 



Secure samples of the chain-stitch seam and the lock-stitch seam, 

 each sewed in loosely woven cloth cut on the bias. First, examine 



HEEL Or UMPtR 



PRE3SER FOOT 



POINT Of LOOPtR 



POINT or UOOPCH 

 FIG. 324. How a chain-stitch machine forms the knot. 



each seam to see which is more elastic, and second, note the ease 

 with which each seam may be ripped. Can you rip out the entire 

 chain-stitch seam by merely breaking one stitch and pulling upon 



