Left is the top stitching and on
the right is the bobbin stitch. This is why I love the dedicated straight stitch machines...no dog leg stitches, but nice and straight :-).
In between, I polished up all these sewing machine benches that had accumulated in my sewing room. They fit under tables so nicely that I didn't realize I had 15 of them. Most of these have gone on to other homes now.