from The Century Dictionary.
- noun A nautical instrument consisting of a stereographic projection of the sphere upon a disk of pasteboard, in which the meridians and parallels of latitude are laid down to single degrees.
from the GNU version of the Collaborative International Dictionary of English.
- noun 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun An
instrumentfor facilitating the practical use of sphericsin navigationand astronomy, constructed of two cardboards containing various circles, turning upon each other in such a manner that any possible spherical trianglemay be readily found, and the measuresof the parts read off.
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