Model for Descriptive Geometry by A. Jullien - Angle between Two Planes with Parallel Horizontal Traces


The two planes are APA’ and BQB’, both perpendicular to the vertical plane. As can be seen in the relief, the horizontal images are the parallel lines PA and QB. Each red string represent a line on each plane that is perpendicular to intersection of the plane with the horizontal plane. These lines meet at (m, m’). The locus of all such intersection points is the horizontal line (wire) coming out of the vertical plane. By rotating (m, m’) about segment sm, the image of the angle of intersection of the planes is given by angle sM1n.

For more details, see COLL.1986.0885 and 1986.0885.01.01.

Date Made: ca 1880

Maker: Jullien, A.

Location: Currently not on view

Place Made: France: Île-de-France, Paris

Subject: descriptive geometry


See more items in: Medicine and Science: Mathematics, Science & Mathematics, Jullien Geometric Models


Exhibition Location:

Data Source: National Museum of American History

Id Number: 1986.0885.01.29Catalog Number: 1986.0885.01.29Accession Number: 1986.0885

Object Name: geometric model

Physical Description: paper (overall material)metal (overall material)Measurements: overall: 6.5 cm x 7.5 cm x 6.5 cm; 2 9/16 in x 2 15/16 in x 2 9/16 in


Record Id: nmah_1802216

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.