I believe these hooks were meant for hanging filters to dry.
One of my favorite visual feature of grain elevators, especially big ones, is how they repeat.
These machines had embossed metal numbers marking their ends.
Note the tiled floor between the bucket conveyors and an old mill.
A better view of the belt system that drives all the machinery in the plant.
Looking from the crane-motor catwalk into the Calumet. The arm shown here with the pulleys looped through it would have been lowered and the bucket conveyor in it would throw grain to waiting ships and boats bound for flour mills and foreign lands.
An old stoker in a power plant that was abandoned long before the mill next to it, by all indications. Sugar mills burned dry beet pulp pellets for fuel.