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（上接1997年第17卷第5期第5页）InstrumentforMeasuringLengthGratingsandLineStandardsupto2mAutomatically(2)NiuLixin;RenDongrnei;WangXiaowei;CaoHang;QiAihui2仪器的机械结构图2所示为仪器的机械结构。仪器由三个水平调节千斤顶支撑着，整个系统安放在一个保温军内。激
(Continued from Volume 17 No. 5, 1997, p. 5) InstrumentforMeasuringLengthGratingsandLineStandardsupto2mAutomatically (2) NiuLixin; RenDongrnei; WangXiaowei; CaoHang; QiAihui2 instrument mechanical structure Figure 2 shows the mechanical structure of the instrument. The instrument is supported by three leveling jacks and the entire system is housed in a heat-insulating arm. Excited