Graphic Design & Printing Technology

Graphic Design & Printing Technology

TYPES OF ORTHOGRAPHIC PROJECTION

Usually there are 4 types of orthographic projections

1. 
   

   First angle projection

   
   


2. 
   

   Second angle projection

   
   


3. 
   

   Third angle projection

   
   


4. 
   

   Fourth angle projection

   
   

In engineering drawing we prefer only the first angle projection.

DIFFERENCE BETW EEN FIRS T ANGLE AND THIRD ANGLE

PROJECTION

First angle projection

The object is placed in the first

quadrant

The object lies between the observer

and the plane of projection.

In this method, when the views are

drawn in their relative position, the

plan comes below the elevation. The

left side view is drawn in the right side

of elevation.

The plane of projection is assumed to

be non transparent

Normally this projection is used in

India and British countries

Third angle projection

The object is placed in the third

quadrant

The plane of projection lies between

the observer and the object

In this method, when the views are

drawn in their relative position, the

plan comes above the elevation. The

left side view is drawn in the left side

of elevation.

The plane of projection is assumed to

be transparent

Normally this projection is used in

USA