Manning, Henry Parker, 1859- · Boston, U.S.A., Ginn & Company · leaf 77
g about it, it fwillrotate about the conjugate line as an axis without sliding 66 NON-EUCLIDEAN GEOMETRY along it. A motion along a straight line combined with arotation about it is called a screw motion. A screw motionmay then be described as a rotation about each of two con-jugate lines or as a… … Given any two lines in the same plane and their common per-pendicular. If we go out on these lines in either direction fromthe perpendicular, they approach each other. Now revolveone of them about this perpendicular so that they are no longerin the same plane. After a certain amount of rotation the…
Geometry, Non-Euclidean
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