I think it is a water tank.
The link provided there is to an article on this Invention.
On the sidebar of that page is a feature called "Worlds First Database iof Farm Inventions" I searched with keyword "electric" and came up with 140 "Inventions" some with pretty intriguing titles, like Electric Fly Trap and Lightning Weeder (kills weeds with Electricity) .. but alas, it's a pay per view type thing!!
I would have liked to see some of those inventions!