Model for Descriptive Geometry by A. Jullien - Representation of a Pyramid

Three points, a, b, and c on the horizontal plane make the triangular base of the pyramid. Point (s, s’) at the bend in the wire will be the apex. The three black strings represent the three remaining edges of the pyramid. Notice that the apex is not above the base. The various projections after rotation to the horizontal plane allow the lengths of the sides to be found. The height of the pyramid is segment sS3.
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
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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