I came across this stitch at Kimberley Quimet, where Kim says it comes from Mary Webb's book 'Embroidery Stitches'.
It's a simple combination of a line of vertical straight stitches, crossed by diagonal ones at each gap.
I began by marking the plain weave fabric with some lines.
Take as small a bite of the fabric as possible at each intersection.
Place a diagonal Straight Stitch across the line
so you cover the little bit of fabric at each intersection.
Worked on counted fabric, the spacing would be easier.
Homework:
Add Ship's Ladder on each of these samplers.
