Show ball lightning the rarest and least understood form of lightning is ball lightning a slow moving globe of fire which varies vanes in diameter between 2 and 20 inches says colliers it is is usually discovered disco ered traveling horizontally a few feet from the ground one of the most remarkable of these fire balls which appeared in in milan italy not long ago floated so slowly down the middle of a street that a crowd of boys were able to walk beside it for half a mile before it struck an obstacle and exploded harmlessly |