In first angle projection, that object is assumed to be in the first quadrant. Hence, the top view is projected below, which lies below the object. Hence when all the three view are drawn, you will get the top view below the front view.

In the third angle projection, the object is assumed to be in the second quadrant. Hence when the entire drawing is finished, the top view remains on the top.

saurav singhania

May 11th, 2012

Difference between First angle projection and third angle Projection are following as :

First Angle Projection :

>>> The object is located above HP(Horizontal Plane) and in front of VP(Vertical Plane).

>>> The object is in between Plane of Projection(POP) and Observer.

>>> In case of First angle Projection left hand side view is seen on the right hand side and the right hand side view is visible on the left hand side.

Third Angle Projection :

>>> The object is located below the Vertical Plane and behind the Horizontal Plane.

>>> The Plane of Projection in between Object and the Observer.

>>> But in case of Third angle Projection left hand side view is seen on the left hand side and the right hand side view is visible on the right hand side.It will be opposite of First angle Projection

vijay

May 16th, 2012

1 st angle at hp and 3rd angle at vp

gobi krishnan.a

May 20th, 2012

First angle projection mean directly proportional from the model view to convert to drafting,third angle projection mean indirectly proportional from the model view to drafting .

rajnikant

Jul 17th, 2012

1) first angle projection menace the diagram which is drawn in first quadrant and third angle projection menace diagram which will drawn in third quadrant.

in first angle projection their will be object is present in between observer and plane becoz of this we can easily see the all views becoz of this first angle

SHOBHIT SACHDEVA

Jul 20th, 2012

In first angle projection, the object is in front of screen and between projector and screen and in third angle projection, the projection screen is between the projector and the object

SANTHOSH KUMAR.K

Aug 9th, 2012

in first angle projection object is placed in b/w plane and viewer .
in thrived angle projection plane is positioned in b/w viewer and object.

Consider side view of any object. In the case of 1st angle projection left side view is drawn in right side & right side view is drawn on left. While considering 3rd angle projection Views are drawn in same side..left view in left and right in right

## What is meant by 1st angle & 3rd angle position in engineering graphics ?

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