This paper briefly introduces the structure and principle of a new system of self-excited oscillations, which is a magnetic pendulum with swing-controlled switch.

本文将对一种新的自激振动系统，即带有摆控开关的磁力摆的结构、原理及实验结果作一扼要的介绍和讨论。

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Based on the theory of horizontal pendulum, the theoretical function model of magnetic error of self adjusting level is deriveted, and observation equation in geomagnetic field is set up.

利用物理摆原理导出了自动安平水准仪磁致误差的理论函数模型，建立了地磁场中的观测方程。

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