Here is a more complicated one. It's a Fulton circular plane, similar to a Stanley 113. By turning the knob on the front the sole plate can be made either concave or convex. It would be used on things like rockers, table edges, etc.. This plane was originally painted, this particular one was very rusty. Taking it apart was a challenge. The two arms with the gears could not be removed so the plating had to be done in stages, moving the arms to get good coverage.