bkay

I 've been studying old machines on the internet for a few weeks, in my quest to learn about them. I found this on the local Craig's list this morning. I think it says it's a Sanger sewing machine. I'm not sure about that as you can see from the photos. However, we had a Sanger Brothers department store here back in the olden days. Of course, it's advertised as a Singer. I've never seen the "doohickeys" on the top before. What is that? Do they do anything? The photos are not very good, but hopefully someone can tell me about it. It's a treadle if you can't tell.
bkay