Third Angle Projection

In the third angle projection method, the object is assumed to be in the third quadrant. i.e. the object behind vertical plane and below the horizontal plane. In this projection technique, Placing the object in the third quadrant puts the projection planes between the viewer and the object and is shown in figure 18.

 

Figure 18. Illustrating the views obtained using  first angle projection technique

Figure 19 illustrates the difference between the  1^st angle and 3^rd angle projection techniques. A summary of the difference between 1st and 3rd angle projections is shown if Table 1.

 

Figure 19 Differentiating between the  1^st angle and 3^rd angle projection techniques.