Help with double stitch please

#1

Hello

I have got a lovely vintage knitting pattern from I think the 1940s. Can anyone explain the term “double stitch” which appears in the instructions. I believe you knit the second stitch on the left hand needle to create a pattern, but I am not sure if this means then knit the first stitch above as well. Any nice clear instructions would be really appreciated. Many thanks.

#2

Insert needle from front to back into the stitch below next stitch,which will be formed of double strands, and draw through a loop; then knit the next stitch and pass the loop over the stitch just knitted

#3

Thanks, I will experiment!