Taylor, you have what we called a cable weeder. There are cables between the wheels that dig into the ground when the wheels turn and bring the weeds/plants roots and all up to the surface and sorta lay them out so they dry out and die.
These are used on well cultivated ground to allow the cables to dig into the ground.
In the area where I grew up it was common practice to let a fields lie fallow for a summer for weed control. When doing this the field was kept black by regular cultivation. Cable weeders and rod weeders as we called them were some of the more common implements used as they didn't pull hard for the width of ground covered.
The last picture of the implement shows one of the wheels the cables were supported by very well. I can't remember the spacing of the wheels but somewhere around four to six feet may have about right?