the mystery of a machine

I've noticed recently that a number of regular knitters are writing about sewing on their blogs. I wonder if this is because temperatures have risen, and wool just seems less appealing.

I have not been exempt from this interest in sewing, though in my case it was inspired less by creative impulse and more from necessity. I recently had to make a faux baby for a play I was working on, something that the actors could hold and that would force them to handle it as they would a real baby. I whipped that up in a few hours, and felt a pang of regret when I had to put the sewing machine away. (There's really not enough time for everything I'd like to do!)

As I often do when I pull out the sewing machine, I looked on ebay for the parts for my machine. Perhaps I should backtrack.

My sewing machine belonged to my grandmother. I think it's from the 70s, not quite as ancient as my mother's old Singer. Anyway, many years ago when I got my machine (brought to New York by my parents, no doubt)it had attachments. Lots of them. My machine is designed for little cams to fit in and then it sews different patterns of stitches. Anyway, my roommate got confused and in a fit of cleaning threw away the attachments. Gone. No stitch designs for me, just straight and zig zag (that's the cam that was in the machine, luckily!)

So when I made my baby prop, I went on ebay and found the attachments. And I won them. And this week, they arrived!All those designs are the stitches the machine does!
In the box, along with needles, bobbins and a few stray buttons were these sewing machine feet. As I have no instruction manual (my roommate threw that away too), and no formal sewing training, I have no idea what they are for. I feel like I'm looking at some medieval machine, though perhaps someone out there knows exactly what I'd use these feet for.This one might turn the fabric under as you sew??Anyone?