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Published online by Cambridge University Press: 14 March 2018
It is usual to divide axes of rotatory symmetry into those of the first and those of the second sort. In the former a crystal is brought into coincidence by a rotation through a certain angle round the axis and in the latter by such a rotation followed by a reflection about (or, as I prefer to say, a reversal relatively to) the plane at right angles to the axis. In 1906 Mr. H. Hilton proposed to define an axis of rotatory symmetry of the second sort as one in which the rotation was followed by an inversion about (reversal relatively to) a point, and he showed that his proposal would, if adopted, simplify the definition of the crystallographic classes.
Page 398 note 1 Hilton, H., Mineralogical Magazine, 1907, vol. xiv, p. 261.CrossRefGoogle Scholar
Page 399 note 1 Evans, J. W., Mineralogical Magazine, 1907, vol. xiv, pp. 360–364 CrossRefGoogle Scholar.