dip needle [地物] 磁倾针
miner's dip needle [矿业] 矿用磁倾仪
dip-needle mechanism 磁倾针机构
dip of the needle 磁针俯角 ; 磁倾角
dip of needle 磁针倾角
dip p needle 磁倾针
Needle dip 倾斜磁针
N a magnetized needle pivoted through its centre of gravity able to rotate freely in a vertical plane, used to determine the inclination of the earth's magnetic field 磁倾仪指针 → see also dip circle
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