Model for Descriptive Geometry by A. Jullien - Angle between Two Lines

Description
The given lines are the black strings: ab’ and dc’. They intersect at (m, m’). Segment ad on the horizontal plane creates a triangle with the given lines as sides. Point n on the horizontal plane is perpendicular to ad through point (m, 0). By rotating the triangle about line ab onto the horizontal plane, point (m, m’) maps to point M2. Angle aM2d is the angle between the two given lines.
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
1986.0885.01.25
catalog number
1986.0885.01.25
accession number
1986.0885
subject
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
Additional Media

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