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装有玻璃度盘和复合成象系统的阿斯卡尼亚一秒精密测角仪(27 E 型分光计)是采用双边成像并借助于秒分划板与光楔的同步位移,可在0～5分范围内,直接读得1秒的读数。
The one-second Ascot’s Precision Goniometer (27 E-type spectrometer) with glass dial and composite imaging system uses bilateral imaging with the simultaneous displacement of seconds reticle and optical wedge, ~ 5 minutes range, read directly 1 second reading.