Anthony, Gardner Chace, 1856- [from old catalog], Ashley, George Francis, [from old catalog] joint author · Boston, D. C. Heath & co. · leaf 74
al axisthrough 5, all possible horizontal projectionsof line A will be drawn from b^ to a linethrough (?2 and parallel to GfL. But all pos- ANGLE BETWEEN PLANES 57 sible horizontal projections must be drawnfrom h^ to the arc e\e\ hence, tf^ the intersec-tion of this arc and the parallel through… … 83. To determine the angle between twoplanes. Principle. If a plane be passed perpendic-ular to the edge of a diedral angle, it intersectsthe planes of the diedral in lines, the anglebetween which is known as the plane angle ofthe diedral. The diedral angle between twoplanes is measured by its…
Geometry, Descriptive
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