The lens provides an orthographic projection is called a telecentric lens. What is first angle and third angle projection. Difference Between First Third Angle Projection Green Mechanic Mechanical Engineering Design Paper Engineering Mechanical Design Japan requires the use of a third angle. . The key difference between third. The object is kept in the third quadrant. The first angle projection is one of the ways to represent three-dimensional objects. First Angle and Third Angle Projection. The first angle projection is utilized mostly in India and various European countries. The Difference Between First and Third Angle Projection Fundamentals of first and third angle projection. You can take the plane of projection to. On engineering drawings the projection is denoted by an international symbol representing a truncated cone in either first-angle or third-angle projection as shown by the diagram on the. H