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第464章 一定是因为洛伦兹!(1 / 2)

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这,这是怎么看出来的?

李昂纳多就这样看着毕方将手表中秒针取出,放在头发上摩擦了几下,垫上树叶送入水中,便指着静止的方向说那是南北。

什么南北?

什么东西?

【我知道,这是洛伦兹定理!】

【说洛伦兹定理的,我缓缓打出一个问号】

【是磁化吧?没上过学吗?和指南针应该是一个道理,不过是暂时性的】

“原理其实很简单,就是指南针的成型原理,不过一个是永久性的,一个是暂时性的。”毕方将水洼中的树叶拿起,沥干水分,将上面的指针重新安回去,扣紧表盘。

“反复的把一截铁丝,或者一根缝衣针沿着同一个方向与丝绸或者头发相摩擦,不知道你们上学的时候有没有玩过用塑料尺在头发上摩擦,然后吸碎纸屑的游戏?

其实是一个道理,铁丝会产生磁性,悬挂起来可以指示北极。

近似于把一个磁铁棒放到地球中心,磁北极极处于地理南极附近,磁南极极处于地理北极附近。磁极与地理极不完全重合,存在磁偏角,但辨别方向上来说,已经完全够了。

这样做的磁性不会很强,隔一段时间之后,你就需要重新摩擦,来增加它的磁性。

如果你有一节电池,它的电压为2伏或者2伏以上,利用电流,你就可以把金属磁化,你也要准备一小截金属线,金属线的外面最好包有绝缘皮。”

【吸碎纸屑那个我知道,我经常玩,狗头.jpg】

【不会吧,不会吧,不会真有人没玩过用塑料纸吸碎纸屑吧?】

【可要是没有手表怎么办?不能每个人都带跟铁丝吧?】

李昂纳多同样提出了这样的疑惑,的确,如果没有手表怎么办?又或者是电子表呢?

这样的方法还是有局限性。

他想从毕方这里知道一种更通用,更普遍的方法。

“没有手表秒针,也可以用薄而平的刮胡刀片来指示方向,因为它是由两类金属粘合而成的。在手掌上小心地摩擦刀片,就可以使它带上磁性,然后把它悬吊起来,可以达到同样的效果。”

“如果这些都没有,你又确确实实迷路了,电话还打不通,那你可以把手机拆了,里面肯定会有,我想手机每个人总该会带吧?或者是手电,一切电子设备都可以。”

李昂纳多还想问,毕方直接制止了他:“算了吧,什么样的情况下,才能让一个人沦落到身上没有任何设备,看不到植物,看不到太阳,连地形都看不到?”

观众会心一笑。

“而且缝衣针或者是曲别针,都是户外探险必备的东西,你都没有吗?”

李昂纳多挠挠头:“我带了水壶,手电,小刀,净水药片,还有医疗箱,就这些了......还有什么吗?”

毕方也懒得说什么,毕竟对方只是业余,可能凭感觉准备了这些东西,能有净水药片都有不错的户外意识了。

“基本的野外生存工具里,刀具是在危急情况下最常用的工具。”

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