spherograph的翻译，读音
释义：
球面三角计算盘
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.
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.