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Crystallographical Notes
Published online by Cambridge University Press: 15 September 2014
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I. Axes of Compound Symmetry of the Second Order.
In recent years, since the more or less general adoption of the systematic classification of crystals under the thirty-two possible types of symmetry, it has become usual to dispense with the ‘centre of symmetry’ as one of the elements of crystal symmetry, and to adopt in its place the ‘axis of compound symmetry of the second order.’
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- Copyright © Royal Society of Edinburgh 1906
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note * page 384 This does not apply to compound axes of higher order, because an axis cf compound symmetry of order n is necessarily an axis of ordinary symmetry of order n/2.