I have a lot of men socks knitting patterns from the 1950s (my mother was probably very busy knitting socks for my dad before my eldest brother came to be!) To my surprise all the socks with argyle patterns or stripes or any design with more than one colour are created on two needles! To finish the socks you sew them up the back! Why is this? One pattern book is British and the second is an old Beehive pattern book.