By | April 27, 2015

An object positioned in space may be imagined as surrounded by six mutually perpendicular planes. So, for any object, six different views may be obtained by viewing at it along the six directions, normal to these planes. Figure “Designation of the views” shows an object with six possible directions to obtain the different views which are designated as follows:

1. View in the direction a = view from the front
2. View in the direction b = view from above
3. View in the direction c = view from the left
4. View in the direction d = view from the right
5. View in the direction e = view from below
6. View in the direction f = view from the rear

Figure [“Relative positions of six views in first angle projection” a] shows the relative positions of the above six views in the first angle projection and Figure [“Relative positions of six views in first angle projection” b], the distinguishing symbol of this method of projection. Figure [“Relative positions of six views in third angle projection” a] shows the relative position of the views in the third angle projection and Figure [“Relative positions of six views in third angle projection” b], the distinguishing symbol of this method of projection.

Features of Lettering in Technical Drawings

NOTE: A comparison of both the figures mentioned below reveals that in both the methods of projection, the views are identical in shape and detail. Only their location with respect to the view from the front is different.