National Museum of American History
Model for Descriptive Geometry by A. Jullien - Intersection of Two Planes
Jullien, A. · ca 1880
Planes APA’ and BQB’ (where A=B=c and A’=B’=d’) are given. Then line d’c’ is the vertical projection of the intersection of the two planes while line dc is the horizontal projection of the intersection.
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