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An optical device for the direct production and viewing of stereographic and gnomonic projections
Author(s) -
Cunningham R. L.,
NgYelim J.
Publication year - 1968
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/s0021889868005583
Subject(s) - stereographic projection , computer graphics (images) , projection (relational algebra) , orientation (vector space) , optics , tracing , simple (philosophy) , computer science , ray tracing (physics) , geometry , computer vision , physics , algorithm , mathematics , philosophy , epistemology , operating system
A simple apparatus for students is described which makes possible the production of stereographic and gnomonic projections by the use of near‐spherical masks cut from ping‐pong balls. By manipulating the masks the evolution of one standard projection from another may be clearly demonstrated. Projections of any orientation may be produced and permanently recorded on tracing paper.