We had a customer bring in a hay trolley for scrap.  Farmers used these to move hay bales inside a barn. It would typically run across a wooden beam.

Vintage hay trolleyThe trolley is a block and tackle used to help a farmworker lift large bales, or other items and move them inside the barn.  It's a good representation of early American agricultural engineering.  The one set of wheels travels on a beam, the other set is the rollers for the rope for the tackle.

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