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

Description
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.
Location
Currently not on view
Object Name
geometric model
date made
ca 1880
maker
Jullien, A.
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
place made
France: Île-de-France, Paris
ID Number
1986.0885.01.29
catalog number
1986.0885.01.29
accession number
1986.0885
subject
descriptive geometry
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Jullien Geometric Models
Data Source
National Museum of American History, Kenneth E. Behring Center

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