Model for Descriptive Geometry by A. Jullien - Special Case of the Intersection of a Line and a Plane

Jullien, A. · ca 1880

As with relief 17, APA’ is again the plane and the red string de’ is on the plane. In this relief, the line is represented by the wire coming out of the horizontal plane and away from the vertical plane (it intersects the vertical plane below the horizontal plane). The point of intersection is at (m, m’) where the wire, the string and the bent wire meet. The horizontal and vertical projections are shown.