物体重心与地球重心的连线称为铅垂线(用圆锥形铅垂测得)。多用于建筑测量。用一条细绳一端系重物,在相对于地面静止时,这条绳所在直线就是铅垂线,又称重垂线。地球重力场中的重力方向线。它与水准面正交,是野外观测的基准线。悬挂重物而自由下垂时的方向,即为此线方向。包含它的平面则称铅垂面。
铅垂线总是垂直于水平面的。
The plumbline is always perpendicular to the horizontal plane.
赫尔楼正在安装和检查调整,以中心线铅垂线。
Hull floors being fitted and checked for alignment with a centreline plumb line.
当墙与铅垂线标准相一致时,木匠才满意,他说这才是对的。
when a carpenter is satisfied that the walls are straight and aligned with the standard of the plumb line, he says that they are “true.”
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