Is there difference between First angle orthographic projection and third angle ?

Question

is just position of images on paper.

Answer 1

*Yes, there is a difference between First angle orthographic projection and third angle.

-First Angle projection:

The object placed in the first quadrant.

-Third Angle projection:

The object placed in the third quadrant.

-Difference between First and Third angle projections

•They differ only in the position of the plan, front and side views:

•First Angle – Eye>Object>Image

•Third Angle – Eye>Image>Object

-In first-angle projection, the "top" view is pushed down to the floor, and the "front" view is pushed back to the rear wall; the intersection line between these two planes is therefore closest to the large end of the cone, hence the first-angle symbol shows the cone with its large end open toward the donut.

-In third-angle projection, the "top" view is pulled up to the ceiling, and the "front" view is pulled forward to the front wall; the intersection line between the two planes is thus closest to the small end of the cone, hence the third-angle symbol shows the cone with its large end away from the donut.