I found this interesting link.
I found a fascinating 1922 book online that you can download. About a third of the book is on attachments. The book is Sewing Machines by Rosamond Cook, a professor at Iowa State. Here is the link:
http://www.archive.org/stream/cu3192...ge/n3/mode/2up
Note: The "full text" format doesn't include the drawings & photos, which are the heart of the book.
Phyllis nm