On the point of an upright needle he laid horizontally a fine steel bar, which could turn to the right and left like the magneticneedle 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。
2
The iron in the ship caused a deviation of the magneticneedle of the compass.
这块在船上得铁引起罗盘磁针的背离。
3
The needle of a magneticcompass points to the magnetic North Pole.