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Precession photography: orienting crystals by means of the stereographic projection
Author(s) -
Rieder M.
Publication year - 1975
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889875010758
Subject(s) - stereographic projection , precession , projection (relational algebra) , orientation (vector space) , optics , arc (geometry) , photography , reading (process) , factor (programming language) , photographic plate , physics , geometry , mathematics , computer science , art , algorithm , law , condensed matter physics , visual arts , political science , programming language
A graphical construction on the Wulff net permits corrections on both arcs and the dial to be determined even if neither of the arcs is parallel to the film and/or the outer arc reading is large. The procedure requires that the orientation errors be multiplied by an arbitrary common factor smaller than ten, while the biggest multiplied error should be less than ten degrees: the corrections are obtained graphically and divided by the factor. Corrections thus obtained are within 10% of their true values.