"We had what was called a Jayhawk hay stacker. It was hitched to the front of the tractor and pushed forward. It had two wheels, so as you moved forward you had to steer in the opposite direction of where you wanted to go. The sweep was mounted on the front of the stacker, so you gathered a load as you drove up the windrow.
"You then drove to the stack site, and as you neared the stack, you pulled a lever that raised the load over the stack. This was done by a cable that wound onto a drum as you moved ahead, thus raising the load. Later models were raised hydraulically. When the load was over the stack, the head was tripped and the hay slid off. The head was lowered as you backed away from the stack, and you went for another load. One of the advantages of this type of stacker was that it enabled you to approach the stack from all directions and deposit the hay where it was needed. This made easier work for the man on the stack. We had to load the hay onto racks in winter and haul it to livestock. Some farmers had stack movers that made it possible to move a whole stack at a time."
From Farming Days, memoirs by Fred Marsh, Eldora, Iowa