Spherograph

1 definition found

From The Collaborative International Dictionary of English v.0.48 [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]