| 摘要 |
A level for determining whether a surface is horizontal and which can also be used to determine the angular relationship between the surface or a line on the surface and the horizontal. The level utilizes a rotating pendulum designed with a pointer that indicates a direction representing the vertical. The pointer (or vertical indicator) is biased in this position by a weight (or alternatively a float) and it points to scale markings that calibrate the position of the rotating pendulum to correspondingly represent the angular deviation of the surface from the horizontal. The weight and the pointer are attached by a set screw which allows the weight to be pivoted with respect to the pointer so that the center of gravity of the rotating pendulum as a whole can be altered and the direction in which the pointer points can be adjusted for accuracy.
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