第866章 壮心全向笔端含(下)
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第866章壮心全向笔端含（下）
【昨天断更的原因众所周知，就不多做解释了，今天会补上。更多小说ltxs520.com】
虽然是一月才得三次的休沐之日，不过沈括仍在书房中忙碌着。
并不是衙门里的事，沈括治事之材，放在当世数万官员中，也是第一流的，衙门里一成不变的琐事，每天只用一个时辰就解决了。
也不是方城山的事。方城山那边，进度已经进行过半，每天传回来的消息都是在说一切顺利。看这样子，除非出现大的意外，否则六十万石纲粮在十一月的时候，肯定能全数抵京。
按道理是现在就可以去筹划庆功宴要怎么开，但襄州那里却没有动静。不过韩冈这位正主都不放在心上，沈括也不会表现得太过急切。
他今天只是在整理着残篇断简一样的片段，分纲目进行记录。等到致仕之后，有了余暇，再进行更进一步的修订，以便成书传世——一部承载了自己毕生的见闻和经历的笔记。
在往日，沈括能得空整理自己的心血，顺便避开总是一幅坏脾气的续弦，心情肯定是很好。
只是今天不同往日，沈括神情严肃的拿着一封信，从书架上抽下一卷已经装订成册的草稿，刷刷的翻了几下，很快就停在了其中的一页上：
‘方家以磁石磨针锋，则能指南，然常微偏东，不全南也，水浮多荡摇。指爪及碗唇上皆可为之，运转尤速，但坚滑易坠，不若缕悬为最善。其法取新纩中独茧缕，以芥子许蜡，缀于针腰，无风处悬之，则针常指南。其中有磨而指北者。余家指南、北者皆有之。磁石之指南，犹柏之指西，莫可原其理。’
对照手边的信，沈括苦笑了一声，韩冈在信中就磁针指南一事，说得更加通透，绝不向自己，只能说一句‘莫可原其理’。
这是前两天韩冈才从襄州寄来的。本来在前一封信中，两人讨论的是北极星与北极之间的角度差异，沈括也只是在信中随意的提到了司南指向的方向，与实际上的南极北极有着不小的区别。
沈括还在京城时，分管过主管天文的司天监，曾经重新设计浑天仪，并通过浑天仪来观察过北极星，持续了三个月之久。
星象之事向来招犯忌讳，从太宗皇帝开始，就禁止民间私下研究，就是官员也很少会光明正大的去研究。沈括也是跟韩冈相熟之后，才会偶尔在信中提到一句两句，而且半点不沾占星判命。
从韩冈的回信中，沈括发现他对于星占甚至是嗤之以鼻，也秉持着依靠张载才兴盛起来的的宣夜说，反对浑天、盖天的说法。
对星象，韩冈的观点不同于流俗。而对于磁铁、司南等堪舆上的用具，他也同样有着一番独特的见解。竟然说大地本身有磁性，南北向，故而能让磁针指南。虽然也纯属臆测，但仔细想过来，却并不是毫无根据。
司南、司北，沈括家里两种磁针都有。将不同种类的磁针针尖对针尖的放在一起，就会一下吸住，而则是互相排斥，如果将磁针掉个儿，情况就正好相反。正符合韩冈在信中所说的‘同性相斥、异性相吸’的这一句。而将两根磁针，一根磁针一根钢针放在一起，磁针的指向也会产生变动。
所以韩冈说藏在地下的磁铁，引得天下磁石能定方向，也不是没有道理。而且南北磁极毕竟不是真的南北极，所以沈括能观察得出两者之间有偏差。
尽管多有臆测，但毕竟能说得圆。
沈括将信纸折了几折，好生的收了起来。
磁石指南的成因只是很小的一桩事，但韩冈从中体现出来的广博学识，又一次让沈括感到惊讶，甚至想不通，他哪里来的这番见识。格物致知四个字，可搪塞不了所有人。
韩冈说黄河之所以为黄，乃是西北高原水土流失之故，河北海退陆进，这是合乎他的经历，沈括也是有着同样的观点。但嵌在太行山壁中的无数贝壳，证明了沧海桑田的之说，自家是出使辽国时，才亲眼见证过。而韩冈并没有去过太行山，就已经一清二楚，并说此乃百万年、千万年、亿万年逐渐演变而来。哪里来的见识？
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