I’m browsing from time to time Project Gutenberg and found last time a book about spool knitting from 1909. They have mittens, bed shoes, a baby ball and much more, all made from I-cords.
It feels to me like a book from the 70th’s ;-))
Perhaps I do a little rummage to play with my knitting spool once more ;-)
Links:
Spool Knitting, by Mary A. McCormack