Albert Barnes Commentary Jeremiah 18:3

"Then I went down to the potter`s house, and, behold, he was making a work on the wheels." — Jeremiah 18:3 (ASV)

The wheels - literally, “the two wheels.” The lower one was worked by the feet to give motion to the upper one, which was a flat disc or plate of wood, on which the potter laid the clay, and molded it with his fingers as it revolved rapidly.