The Wulff net
Having understood how the projection is constructed, we can now look at how it is examined using the Wulff Net. The net is a projection of a collection of great and small circles, which represent lines of latitude (small circles) and lines of longitude (great circles) on the sphere, as seen here:
If we consider rather more of each, we can project them downwards as before using the principle of projection to construct a stereographic projection of planes which are two degrees apart. This creates the Wulff Net.
This can be used to place planes and poles of planes on a stereogram with great accuracy. It allows the maintenance of angular truth, while still being easy to draw.