I don't think Joe can watch You Tube on dial up?
Joe, it advances the fabric with the needle, and a bit with the foot of the machine. Instead of a round hole for the needle to travel through to get to the bobbin, it's an elongated hole, that allows the needle to move front to back while it's in the bobbin area. Once it gets to the back, the needle lifts and starts the cycle over. These machines are engineered to stitch 1200 stitches per minute, which is not bad for a treadle machine!
Ok Caroline...I understand if you don't care if your manual and attachments, along with the machine are good enough for you...I was just trying to help....
~wink and a grin~ If you'll share that last name with me, I'll help you look for Mrs. William ???
ETA: I forgot to ask...did you join the Davis VF yahoo group yet? You need to enter the machine's info in the database...we can get a good idea of the date that way!