This paper gives a brief description of various kinds of facilities, reconnaissance and surveying, and design of transit marks of a swingingground for magnetic compass adjustment.
本文对磁罗经校正场的设备种类、勘察测量和标志设计等作了扼要的阐述。
2
Begin swinging the hoop clockwise so the hoop is parallel to the ground.
开始顺时针摆动呼啦圈，让它与地面平行。
3
Please leave ample room on both sides for swinging or ground looping.