(xiii) Whipped zig zag stitch - loosed bobbin tension and tightened upper tension; adjusted length and width of stitch.
(xiv) Whipped feather stitch - loosened bobbin tension and tightened upper tension progressively; white thread on top, black in bobbin.
(xv) Whipped zig zag - controlled stitch length; white thread on top, black on bottom; loose bobbing tension, tight upper tension.
(xvi) Whipped straight stitch - stitch length and gaps alter tone.
This was my first attempt at trying whipped stitch. I bought a new bobbin to use for this type of machine stitching. I had to alter the bobbin tension a lot to see any noticeable results. I can see that this stitch holds lots of possibilities, especially in colour work, eg for 'pointillist' painterly effects.