Up and down blanket stitch

A variation on regular buttonhole or blanket stitch, where alternate stitches are narrow then widely spaced.
For more background see the entry for blanket stitch.
Method
Working from left to right, bring the needle and thread up on the baseline and take it down on the top line, leaving a loop on the surface.
Bring the needle up in the loop on the baseline and tighten the loop against the working thread.
Take the needle down further along the baseline ensuring to leave a gap of a threads thickness, draw the thread to the back leaving a loop on the surface.
Bring the needle up on the top line very close to the previous stitch.
Whilst the needle is still in the fabric, throw the surface loop over the needle
and draw the thread through to complete your first ‘Up and Down’ stitch
Repeat these steps again to produce a series of ‘Up and Down’ stitches evenly spaced to achieve an Up and Down Blanket stitch
Up and Down blanket stitch

Structure of stitch
Embroidery Techniques
Related Stitches
Identifying Up and down blanket stitch
A continuous line of scallop looking Blanket stitches tied together in pairs
Each stitch should be a mirror image of the adjacent stitch
References
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Betty Barnden, The Embroidery Stitch Bible (2003) , p.62