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易门铜矿引进了徐州光学仪器厂产品陀螺经纬仪,该仪系利用高速旋转体的旋转轴能够指示方向的特性而制成。引进的型号是JG_6-T_(60),一次定向中误差小于60秒,此种测量仪为国内70年代的一项新产品。
Yi Men Copper Mine introduced Xuzhou Optical Instrument Factory products gyro theodolite, the instrument uses high-speed rotating body axis of rotation can be made of the characteristics of the direction. The imported model is JG_6-T_ (60). The error in one orientation is less than 60 seconds. This kind of measuring instrument is a new product in the 70s in China.