So a pendulum one meter long has a period of about two seconds.
因此1米长的钟摆，所用周期是2秒。
2
The structure and principle of a two-dimensional vertical pendulum tilt meter and a capacitance mini-displacement sensor are introduced.
介绍了二维垂直摆倾斜仪的结构及工作原理，电容式微位移传感器的组成及工作原理。
3
Tilt meter is one kind of basic instrument of earth tide and the earthquake research, which includes the horizontal pendulum tilt meter, the water tube tilt meter and the vertical pendulum tilt meter.