Bible Dictionaries
Spherograph
Webster's Dictionary
(n.) 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.
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Bibliography Information
Webster, Noah. Entry for 'Spherograph'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​s/spherograph.html. 1828.