National Museum of American History
Model for Descriptive Geometry by A. Jullien - Image (Rotation) of a Vertical Plane about a Line in the Horizontal Plane
Jullien, A. · ca 1880
Plane APA’ is a plane perpendicular to the horizontal plane with point (m, m’) on APA’ (at corner of wire). Vertical and horizontal projections are shown, as well as rotation about line AP in the horizontal plane.
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