spherograph
📖 中文释义
- 球面三角计算盘
📘 English Definition（英文释义）
- 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.