A knob is a hill. Most likely open (unforested) or covered with sheets of rock. I'm pretty sure that New Hampshire has some peaks with Knob as part of the name. With my corrupted system searches are a pain. Eliot may have used the word knob instead of hill to bring us back to the house image (door knob). I think though that he wanted the image of a sphere (as with a door knob) to represent the earth. Under a windy knob / In a world of life Regards, Rick Parker