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。
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..
这块在船上得铁引起罗盘磁针的背离。
The iron in the ship caused a deviation of the magnetic needle of the compass.
由于船上的铁，导致了罗盘上磁针的偏离。
The iron in the ship caused a deviation of the magnetic needle of the compass .
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