Precession photography of fibres: Prediction of patterns

The Buerger precession method of recording x-ray diffraction patterns can also be used for fibres. This method has some advantages over the conventional flat plate method. Since the fibre has inherent cylindrical symmetry, the precession photograph of the fibre is equivalent to the ‘rotation-precession’ photograph of a single crystal. An analytical prediction of diffraction patterns of the rotation-precession photography is discussed. Also, experimental data are provided to confirm the validity of the equations derived.