Greninger chart
In crystallography, a Greninger chart is a chart that allows angular relations between zones and planes in a crystal to be directly read from an x-ray diffraction photograph.
The Greninger chart is a simple trigonometric tool to determine g and d for a fixed sample-to-film distance. A new chart must be generated for different sample to detector distances. The Greninger chart gives directly the two angles needed to plot poles on the Wulff net. It is critical to keep track of the relative arrangement of the sample to the film, if photographic film is used then this is achieved by cutting the corner of the film. For Polaroid film one must make a note of the arrangement of the face of the film in the camera.
