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Next: Columns with Discrete Symmetry Up: Columns with Continuous Symmetry Previous: Fluted Columns

Spiral Columns -- Two Types

There are two types of spirals -- both of which have twisted translation symmetry. There are the spirals that are symmetric when the column is rotated by $180^\circ$ in a plane containing the axis of the cylinder ( ${\bf Z}_2(\tau\kappa)\dot{+}{\bf L}$ )and those that do not have this symmetry (${\bf L}$ ). See Figures 8 and  9.


   
Figure 8:Spiral column with no up-down rotation.



   
Figure 9:Spiral column with up-down rotation.




next up previous
Next: Columns with Discrete Symmetry Up: Columns with Continuous Symmetry Previous: Fluted Columns

Marty Golubitsky
2001-01-29