First Angle Projection

First Angle Projection

First Angle Projection is commonly used in all countries other than United States. The Indian Standard Institution (ISI) recommend the use of First Angle Projection method now in all the institutions.

The difference or comparison between First Angle Projection and Third Angle Projection is well described in next chapter.

In first angle projection the object imagined to be in the first quadrant.

The object is lies between the observer and plane of projection. The plane of projection is assumed to be non transparent.

When view are drawn in their relative position Top view comes below Front view, Right side view drawn to the left side elevation.

A First Angle Projection drawing is identified by the first angle projection symbol. The angle of projection symbol typically appears in angle of projection block near to Title block.

Mechanical Basics                                                                                        Third Angle Projection