Spherograph
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]

The Collaborative International Dictionary of English. 2000.

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  • spherograph — sphero·graph …   English syllables

  • spherograph — ˈsfirəˌgraf, fer , grȧf noun Etymology: sphaer + graph 1. : two cardboards used especially in navigation and astronomy, containing various circles, and turning upon each other in such a manner that any possible spherical triangle may be readily… …   Useful english dictionary

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