National Museum of American History
Model for Descriptive Geometry by A. Jullien - Representation of a Pyramid
Jullien, A. · ca 1880
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 sS<sub>3</sub>.
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