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在使用或检定水平仪时,如果忽视了对横向小水准泡的注意,忽略了它的应有作用,将会给分度值的读数或检定结果带进误差。因为水平仪的主水准泡内壁为一半径很大的圆弧,实际上可以认为它是从一个半径很大的圓管环上切割下来的。其圆弧的空间位置是有方向要求的。只有将其安置在与水平面相垂直的方向上时,它的角值才可按下式计算: 式中a_1a_2≈a_1a_2+2毫米对于4″的水平仪,R=103米。如果横向水泡的零位与主水池的曲率方向一致,就可以用横向水泡是否对中来判断主水泡的曲率方向之位置是否正确。当圆环与水平面相垂直时,主水泡的曲率半径约为103米(图1)。当圆环与垂直平面倾斜成α角时(图2),水泡在圆环上所处位置的曲率半径必然增大(因
When using or checking the spirit level, ignoring the attention of the lateral small bubbles and neglecting its proper function will bring errors to the readings of the graduation values or the verification results. Because the level of the main water level inside the bubble wall is a large radius of the arc, in fact, it can be considered from a very large radius of the pipe ring cut down. The arc of the spatial location is the direction of demand. Only when it is placed in a direction perpendicular to the horizontal plane is its angular value calculated as follows: where a_1a_2≈a_1a_2 + 2 mm R = 103 m for a 4 "spirit level If the horizontal blisters zero With the direction of the curvature of the main pool, the position of the curvature of the main blisters can be judged by whether the horizontal blisters are centered or not, and the radius of curvature of the main blisters is about 103 meters when the ring is perpendicular to the horizontal plane (Figure 1) When the ring is angled at an angle α to the vertical plane (Figure 2), the radius of curvature at which the blisters lie on the ring will inevitably increase