A large instrument having a fixed and a movable arm on a graduated stock, used for measuring the diameters of logs and similar objects.
测径器一种大仪器，在一刻度盘上有固定且可动的测脚，用于测量圆木和类似物体的直径。
By measuring the coordinate positions of a series of fixed targets from several instrument locations and calculating the measurement results, the working uncertainty of the total system will be given.
通过移站测量来获得几个固定点的坐标位置，然后将测量结果进行处理，给出整个测量系统的测量不确定度。
A new measuring instrument of rotational inertia has been devised by the fixed - axis rotation principle and parallel axis theorem of compound pendulum.
利用复摆定轴转动原理和刚体平行轴定理设计的一种新型转动惯量测定仪。
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