我们激光指向仪研制小组初步试制成功一台竖井激光指向仪,于1974年3月中旬,到兗州煤炭建设指挥部第一工程处的施工工地北宿矿进行试验。我们同工人、技术人员相结合,在矿山和学校党委的领导下,经过3个月的反复研究试验,改进了原有仪器,应用于生产,受到现场工人、工程技术人员的欢迎。过去,掘进竖井是用悬吊重锤放大线来定井筒中心线的,操作起来既笨重,又不安全,每次放线收线,要花费很多时间,悬吊的钢丝还容 Our Laser Pointing Instrument Development Team successfully piloted a vertical shaft laser pointing instrument. In mid-March 1974, we experimented at Beiyu Mine, the construction site of the First Engineering Department of Yanzhou Coal Mining Construction Headquarters. With the combination of workers and technicians, under the leadership of mines and school party committees, after three months of repeated research and experiments, we improved our existing instruments and applied them to production and were welcomed by field workers and engineers. In the past, the shaft was dug with a heavy hammer to enlarge the line to set the centerline of the wellbore, which was both bulky and unsafe to operate. It took a lot of time to take off the wire each time.