Fig. 53. Miter Joint at Corner of Picture Frame
25. Nails. The nails in common use are of two kinds, cut and wire.
Two views of a cut nail are shown in [Fig. 54], a being the side view and b the front view. Notice that in the front view the sides converge like a wedge, while in the side view they are parallel.
Fig. 54. Use of Cut Nails
Care must always be taken that the point does not enter the wood as shown at c, as the wood will be split by the wedge action; d shows the proper method.
Steel wire nails are now in general use. They are made from wire and are consequently round in section, with a comparatively sharp point. There are two distinct kinds, named flat head and bung head.
Flat-head wire nails, as the name implies, have thin, flat heads, which prevent the nail from being driven beneath the surface.