Spherograph

Spher"o*graph

(?), n. [Sphere + -graph.] An instrument for facilitating the practical use of spherics in navigation and astronomy, being constructed of two cardboards containing various circles, and turning upon each other in such a manner that any possible spherical triangle may be readily found, and the measures of the parts read off by inspection.
[1913 Webster]

 

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Sun 16th December 2018