Spherograph
Spher´o`graph
| n. | 1. | 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. |
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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