Abstract
The procedure for a perfect, accurate and rapid determination of orientations of tetragonal tin single crystals by the use of light figures has been worked out. Full accounts are given of necessary geometrical relationships, etching technique, measurable ranges and kinds of angles, stereographic representation of crystal orientations, and the accuracy with reference to various actual examples. It is shown that perfect determination of crystal orientations can be made with an accuracy well within 1° by the use of the {001}, {100} and {101} light figures produced by etching with concentrated aqua regia.
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