the upwardly projecting prongs thus producedare bent alternately inwardly and outwardly and coact with the flakes-at the lower end of the post or pole to firmly maintain the latter in an upright position in the ground into which it is driven, when subjected to laterally or vertically acting forces.
An article of the class described c0mprising a bar having angularly disposed sides and vertically successive prongs pro.- jecting upwardly therefrom in planes substantially parallel to the longitudinal axis of the bar.
