First angle and third angle projection methods are widely used for the representation of engineering drawings. A collection of 2D drawings of any 3D object is represented with the help of orthographic projection. The orthographic projection consists of 6 views (Front, Back, Top, Bottom, Right, Left) called as principle views. Among these six.. 1.6 First and Third Angle Orthographic Projection Symbols. Standard Symbols. Recommended Proportions for symbols: The symbols for first and third angle are based on the frustum of a cone as shown. Frustum of cone in the first quadrant: First-angle projection; View from the left appears on the right.

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-first angle projection, used in the rest of the world. So far we have only looked at third angle projection, since this is used here. Figure 3.1.7 shows a part in third angle projection, Figure 3.1.8 shows the same part in first angle projection. To avoid confusion, drawings must be identified by means of the symbols shown in Figure 3.1.9 as.. In first angle orthographic projections the object is considered as being rolled over to either side, so that the right side of the object is drawn to the left of the front elevation: It is mandatory to indicate the method of multiview projection by including the appropriate ISO (International Organization for Standardization) projection symbol.