typical GT1790A - Page 31

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Purl stitch
Whip stitch
Whip stitch
Purl stitch
When applying higher tension to the needle thread to permit it to
pass straight through fabric, the purl stitch is formed by the bobbin
thread which is pulled over from both sides to the center line.
Whip stitch
The whip stitch is formed in zigzag showing the needle thread
only on top of fabric, and the bobbin thread on the back.