- magnetic needle
- 磁针: magnet needle; magnetic need ...
- 指南针: compass
- 指南针: compass 中国首先发明指南针。 战国时期, 中国已经用磁石制成了指南的仪器, 古人称它为“司南”。 北宋时, 又发明了用天然磁石磨擦钢针制成的罗盘针, 即真正的指南针, 并应用于航海。 13世纪指南针传到欧洲。 the compass was invented in china. as early as in the warring states period (450 b.c.-221 b.c.), a magnet was used as a device that pointed to magnetic north, and this device was named “si nan” by the ancient chinese. in the northern song dynasty (960 a.d.-1127 a.d.), another device was invented with a magnetic iron needle that pointed to magnetic north, and this device was later used in navigation. the compass was introduced to europe in the 13th century
- 灯指南针: hy dc 20led
- 地质指南针: geologic compass; geological compass
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