I actually have a hand crank generator exactly like that, except without the box and bells. I found it in the store room of the high school I started teaching at back in 1988.
My dad gave Me one like it as a child, He said it came from the Phone Co. I think they used it to ring out wire pairs. If I remember it will give you a good shock if you hold the wires and crank it. It is nothing more than a simple magneto.
Its a redneck fishing outfit, drop the wires in the water, give it a couple of cranks, fish float to surface, scoop fish into boat, repeat as necessary.
Disclaimer: This is highly illegal, and very unsportsman-like.