Model for Descriptive Geometry by A. Jullien - Angle between a Line and a Plane

The given plane is CPC’ and the line goes from b on the horizontal plane to a’ on the vertical plane. The holes can be seen in the image, but the black string is missing. Point (m, m’) is any point on the line. Construct the line from (m, m’) to point d on the horizontal plane that is perpendicular to the plane. This line is the wire protruding out of the horizontal plane. Through the use of several projections seen in the relief, point M2 on the horizontal plane is the image of the rotation of point (m, m’). Then angle fM2d on the horizontal plane is the angle between the given plane and line.
For more details, see COLL.1986.0885 and 1986.0885.01.01.
Currently not on view
Object Name
geometric model
date made
ca 1880
Jullien, A.
Physical Description
paper (overall material)
metal (overall material)
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
place made
France: Île-de-France, Paris
ID Number
catalog number
accession number
descriptive geometry
Science & Mathematics
Jullien Geometric Models
See more items in
Medicine and Science: Mathematics
Jullien Geometric Models
Data Source
National Museum of American History, Kenneth E. Behring Center

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