101. Nail Armatures. Fig. 48. A nail, N, placed through a piece of wood, A, will serve as a very simple armature. To make it a little heavier, if necessary, a piece of annealed iron wire, W, may be wound around N. Care should be taken to have the two parts fairly alike in size and weight.
Fig. 48.
102. Wire Armatures. Fig. 49. Annealed iron wires make good armatures. The short lengths of wire should be straightened ([See App. 28]) before binding them into a bundle. They may be held together with thread or paraffine, until they are in place, as, for example, in a wooden piece, A, Fig. 49. The bundle of wires should fit snugly into the hole made through A, and the wires should be bound together at each end with wire.
Fig. 49.