magnetic needle 针形磁铁 ; 小磁针 ; 中间支起的针形磁铁
square frame of magnetic needle 方框罗针 ; 直角边缘孔板
declination of magnetic needle 磁偏角
On the point of an upright needle he laid horizontally a fine steel bar, which could turn to the right and left like the magnetic needle in a compass-box..
他在一根垂直的针头顶点，设置了一根水平的钢制细棍，它可以左右转动，就像罗盘里的磁针那样。
For a typical magnetic needle, the initial signal peak became proportional to the velocity step after a threshold value of velocity was over taken.
对某个特定磁探针来说，其初始信号峰值与速度成正比的条件是速度大于某个阈值。
The iron in the ship caused a deviation of the magnetic needle of the compass.
这块在船上得铁引起罗盘磁针的背离。
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