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平板仪测量已广泛用于生产中,要建造一座厂房、修建一个水库,都需要用平板仪绘制它的平面图。平板仪测量也已经是中学数学教学的教材。在用导线法绘制平面图时,常要把平板仪移动数次。当移至新的测点时,要把平板仪重新安置,使其符合三个要求:首先保持水平;其次,要保持原来的方向(如指北的方向);再次,要使地面上测量的点和图上对应的点在地面的同一垂线上。然而这个调节工作却是一椿麻烦的事,愿此失彼是常见的现象:调整了水平位置后,方向还未对准;对准了方向,却发现对应点不在同一垂线
Flat-panel metering has been widely used in production. To build a factory building or construct a reservoir, you need to use a flat-panel meter to draw its plan. Flat-panel metering has also been the teaching material for middle school mathematics teaching. When drawing a plan with the wire method, it is often necessary to move the platen several times. When moving to a new measuring point, the tablet instrument should be repositioned to meet three requirements: first to maintain level; second, to maintain the original direction (such as the direction of the north); again, to make measurements on the ground The corresponding points on the points and maps are on the same vertical line on the ground. However, this adjustment work is a troublesome thing. It is a common phenomenon that this is missing: after adjusting the horizontal position, the direction has not been aligned; when the direction is aligned, it is found that the corresponding point is not on the same vertical line.