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
Rahul wayal
Jan 22nd, 2015
First angel projection - when we assume the object to be in the first quadrant, the projection is called first angle projection .
Third angle projection
when we assume the object to be in third quadrant , the projection is called as Third Angel Projection.
Parthasarathi lenka
Sep 29th, 2015
1st angle means all the three views are drawn but you will get the top view below the front view.
3rd angle means when the entire drawing is finished, the top view remains on the top.
Gowtham
Aug 10th, 2017
In first angle projection object in between the projection pane and the observer.
In third angle projection proj plane inbetween object and observer
victor
Nov 1st, 2017
In first angle, the object is in 1st quadrant, in third angle, the object is in 3rd quadrant.
sandeep
Nov 15th, 2017
In first angle - the object in between observer and plane of projection
In third angle - the plane of projection in between observer and object
What is meant by 1st angle & 3rd angle position in engineering graphics ?
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