National Museum of American History
Model for Descriptive Geometry by A. Jullien - Rotation of a Point about an Axis in the Horizontal Plane
Jullien, A. · ca 1880
Point (m, m’) is rotated about line ab. Point n on the horizontal plane is the foot of the perpendicular from the point to line ab. Point M<sub>1</sub> is the result of rotation of the point about line nm; M<sub>2</sub> is the result of rotation about line ab.
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