第649章 罗盘
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李孝恭如获至宝，教人那了一个木匣子来，将夏鸿升送于他的那些关于琉球及苏禄、呵罗丹等地的资料全都锁了进去。龙腾小说ltxs520.com
“贤侄放心，本王到了琉球之后，定然照着贤侄的计划，一步步的来，经略好这些地方。”李孝恭大为兴奋，仿佛这些功劳已经到手了一般，对夏鸿升说道：“本王当重谢贤侄才是啊！”
夏鸿升摇了摇头，笑了笑，说道：“小侄拿出这些东西来，又岂是为了让伯伯感谢的？小侄是为了大唐啊！”
“不错，本王亦是为了大唐，贤侄给本王的东西，本王定然不教它浪费掉！”李孝恭拍着胸脯说道。
“对了，伯伯，以咱们大唐现在的海船，和航行技术，是没法到达那么远的地方的。”夏鸿升对李孝恭说道：“伯伯此去只管先经略琉球，使琉球成我大唐水师于南海之后方基地。过去一年半载，小侄必定造出有能力进行远航的海船，想出相干的航海技术出来。到了那个时候，伯伯便可直接在琉球造船出海，南下而行！”
“好！本王就等贤侄的好消息了！”李孝恭自信满满的说道：“贤侄放心，等到贤侄造出海船来的时候，琉球定然如同我大唐其他的地方一样安稳！”
“好！”夏鸿升叫好一声，又说道：“小侄自然相信伯伯的本事！不拘是带兵打仗，还是治理百姓，伯伯都是咱们大唐的一把好手！小侄就再送一样东西给伯伯！”
“甚子东西？”李孝恭立刻兴致更高这夏鸿升拿出来的东西，样样是宝啊！
夏鸿升拿出一样东西来，是一个圆盘，中间有一针，随着夏鸿升手的动作，那针头不断转动，始终指着一个方向。
“这东西，送给伯伯，做海上指向之用。”夏鸿升将东西给了李孝恭，说道。
李孝恭接过来看看，说道：“这东西……倒是与那司南很是相似。”
“不错，其作用正与司南一样。”夏鸿升点了点头，说道：“小侄将其稍微改动了一些，更加便于在船上使用。司南乃是天然磁石所制，而天然的磁石不容易找到。而且到了船上，水中又颠簸，司南之勺常随颠簸晃动，指向不准。这跟针以磁石摩针锋，则能指南，伯伯只需备好一块磁石就行。若是找来磁石，应急之时亦可用薄铁叶剪裁，长二寸，阔五分，首尾锐如鱼型，置炭火中烧之，侯通赤，以铁钤钤鱼首出火，以尾正对子位，蘸水盆中，没尾数分则止，以密器收之。用时，置水碗于无风处平放，鱼在水面，令浮，其首常向午也。这也可以使普通的针变成磁针。到了船上，弄一木盆，盆中满水，将此物放于盆中水上，则无论船只颠簸，其总能在盆中保持水平，继而指向，此乃水浮法；亦或将磁针搁在碗口边缘，磁针可以旋转，指示方向，此乃碗唇旋定法；又可将磁针搁在手指甲上面由于指甲面光滑，磁针可以旋转自如，指示方向，便是指甲旋定法；又或是往磁针中部涂一些蜡，粘一根蚕丝，挂在没有风的地方，就可以指示方向了，此乃缕悬法。这四种法子，皆是使用这指南针的法子，伯伯可据情况不同，结合使用，以便更准确的找出南北不过，伯伯须知，磁针常微偏东或“偏丙位，使用时候需要加以分析，确定方位。”
李孝恭点了点头，说道：“这磁针磁勺，盖形状不一，用法倒也差不多，贤侄放心。不过，这磁针地下的圆盘，老夫却是未曾见过。”
“此乃分度盘，加到这上面，用着更加方便，读数容易。地以八方正位，定坤道与舆图，故以正子午为地盘，居内以应地之实。天以十二分野，正躔度之次舍，故以壬子丙午为天盘，居外以应天之虚。便是分度盘之方向用法。”夏鸿升对李孝恭说道：“这两样东西何在一起，小侄叫它罗盘。小侄做的匆忙，这东西眼下也只是临时用用，随后小侄好生做出来，可使罗盘同磁针合二为一，做成旱地罗盘，用不着再置于水中，拿在手里便可使用。”
李孝恭听了夏鸿升念出的口诀，心理一惊，立刻拿着罗盘，命人端了水来，站了起来端着，在正堂中走来走去，低头仔细看着罗盘，来回换着方位。
“好东西！”李孝恭兴奋的叫道。
夏鸿升同李孝恭二人一直商量琉球的事情，直到中午，李孝恭又摆下家宴，二人又是边吃边继续商议，又一直持续到了下午。
“贤侄之才，真是……”李孝恭对夏鸿升说道：“本王都不知道该如何形容了。总之，贤侄放心便是。贤侄将这些东西都交于本王，本王绝不让贤侄的主意落空。”
“伯伯谬赞了，凭伯伯的本事，区区琉球而已，还不是手到擒来。小侄只是锦上添花而已。”夏鸿升笑着摇头说道。
李孝恭哈哈笑了几声，又对夏鸿升说道：“不过，有件事情须得给贤侄先说说。贤侄交于本王的这些东西，这些事情，事关巨大，本王需将今日你我所谈，事无巨细，皆告知于陛下。贤侄也能理解吧？”
夏鸿升点了点头：“伯伯您看着办就是。”
夏鸿升当然能够理解李孝恭的用意。若说只是到琉球去剿灭海贼，夺回稻种，那自然用不着对李世民说。可是夏鸿升在南海所谋划之大，则就必须得让李世民也知道了。李孝恭此举是为了避嫌，也是为了避免以后因为经略南海的事情，而被皇帝猜忌。
李孝恭见夏鸿升答应，于是笑着点点头，不过却又疑惑问道：“既如此，那贤侄怎么不直接告知于陛下？”
“小侄这个饼子画的有些大，单凭小侄一人之口，陛下或许暂时不愿意在南海及水师投入太多之精力。毕竟，陛下眼前的目标是在民生。”夏鸿升笑了笑，对李孝恭说道：“可是若是说通了伯伯，伯伯亦觉可行的话，伯伯深受陛下倚重，若是加上伯伯的口舌，那陛下就会认真去考虑这件事情了。”
李孝恭哈哈大笑起来：“你小子，果然一肚子的弯弯道道！”
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