National Museum of American History
Model for Descriptive Geometry by A. Jullien - Intersection of Two Planes with Parallel Horizontal Projections
Jullien, A. · ca 1880
Planes APA’ and BQB’ are parallel in the horizontal plane (see their respective horizontal projections AP and BQ) and intersect along line (o, c’)-(d, d’) (wire). This intersection is also parallel to the horizontal projections of the two planes (observe that cd is also parallel in the horizontal plane).
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