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(一○五)使用微倾水准仪时,为什么每测一点都要重新调整气泡?微倾式水准仪是在我国广泛使用的一种水准仪。这种仪器的特点是,望远镜与水准管结为整体,但与竖轴并不固连,利用微倾螺旋可任意改变它们的关系。因此,视准轴和水准管轴不是经常和竖轴垂直,而可有微量的倾斜。由于这一特点,当气泡在一个方向居中(符合),转到另一个方向就可能不再符合了。另外,这种仪器装有精度较低的圆
(five) When using a micro-tilt leveler, why do you need to re-adjust the bubble every time you measure it? A micro-inclined level is a level that is widely used in our country. The characteristic of this kind of instrument is that the telescope and the level tube are integrated, but they are not connected with the vertical axis. The relationship between them can be arbitrarily changed by using a helix. Therefore, the collimation axis and the leveling tube axis are not always perpendicular to the vertical axis and may have a slight inclination. Due to this feature, when the bubble is centered (in line with) in one direction, it may no longer meet the direction that it is in the other direction. In addition, this instrument is equipped with a less precise circle