The large chucky foot ...this is a seam guide. You have a small hole to the right of your throat plate..you take the large screw and put the plate nex to your foot. You then slide it to your measurement of the seam allowance you will be using.
This was used before the 1/4" foot was made.
I still use mine when I'm making clothes for my GD.
The middle foot is a rolled hem foot.
The other foot is a darning or free motion foot.