Consider a bedding plane with a strike of 060° and a dip of 30° towards the SE (i.e. 060/30SE, see Fig. 10a). It is required to plot the great circle representing this plane. Besides drawing a great circle, it is possible to represent a plane on a stereogram in another way. Any plane can be represented by means of a line which is perpendicular to the plane. This means that the plane projects as a dot on the stereogram called the pole of the plane. The method of plotting the pole of bedding plane 060/30SE is also explained below.

1. 1 An important preliminary to constructing an accurate stereogram is to anticipate the outcome in advance. Force yourself to visualize the projection process before you start drawing the final stereogram. Sketch first a miniature map with the appropriate symbol (Fig. 10a), imagine how that plane will look when placed in the lower half hemisphere (Fig. 10b) and sketch a stereogram, i.e. the bird's eye view of the lower hemisphere (Fig. 10c). Get into the habit of making these sketches – it will mean that you will avoid making drastic plotting errors.

2. 2 Insert the letters A–B and X–Y at the extremities of the diameters of the net, as in Figure 10d.

3. 3 Place the overlay on the stereonet and pierce both with a drawing pin through their respective centres.

4. 4 Mark north on the overlay, together with the primitive circle.

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