'Spherograph' definitions:

Definition of 'Spherograph'

From: GCIDE

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]