- 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.