Found something interesting! It's a pdf file of an old book titled, "The Lady's Book of Knitting." Published in 1886. The description of double knitting had me scratching my head. I think in those days, everyone knew how to knit some, and these instructions simply made sense. Similar to old cookbooks that read, "add "some" butter. etc.
You really have to take a look through this book. You can make yourself "Drawers" and "Another Pretty Pattern." It's like a mystery pattern grab-bag.
Cast on any number of stitches.
Knit a plain row.
2nd row. - Slip the first stitch, knit the second in a usual manner, but
put the thread twice round the needle. Then bring the thread forward as if you were going to pearl, only do not
pearl, but take the stitch off, and put the wool in front of the stitch back to its place. Then begin again and knit a stitch with wool twice round the needle.
3rd row. - Knit the first stitch. Bring the wool forward, and take off the long stitch, putting the thread down in front. Knit the short stitch, putting the thread twice round the needle.
I wonder what this turns out to look like. They talk about using thread and wool?? Any comments? Here is the link