The Downfall; illustration from p.505 of the 1861 book "Lake Ngami". A, target; B, a downfall, consisting of a log of wood; C C, stones attached to the downfall to increase its weight; D, the harpoon affixed to the lower end of the downfall; E, a tree, or, in lieu of it, an artificial support of about twenty-five feet in height; F F, trip line.