The stereographic projection
E. J. W. Whittaker
Teaching aims To
provide a practical and theoretical introducion to the stereographic
projection to enable students to use it in morphological
crystallography and X-ray textural studies of polycrytalline materials.
Level Normally first year undergraduate, but there
are no concepts involved that would not be available to students one or
two years earlier than this.
Simple geometrical constructions. Some applications may require a
knowledge of spherical trigonometry, but this is not needed to
understand the subject as presented.
Practical resources A ruler and compass and
tracing paper. However the method will only come to life if it is
applied to some real data such as measurements of interfacial angles
crysal models using a simple contact goniometer (a protractor with a
Time required for teaching One or two lectures.
These would probably be within a series on morphological crytallography
and the practical work (about 6 hours) would form part of such a