Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 274
idian Planes. Attention has already beencalled, in the preceding constructions, to certain properties of XXIII, § 184] PLANE AND TORUS 253 the points which lie in the principal meridian plane and themeridian plane of symmetry. These points are of sufficientimportance to warrant a further… … Fig. 314. only the points lying in the meridian plane of symmetry 3f,and the principal meridian plane Y, the construction being thesame as that used in Fig. 312. The construction is repeatedin Fig. 314 for the same planes M said Y. In this case we findthat there are no points in the meridian plane…
Geometry, Descriptive
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