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第578章 炮术(1 / 2)

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对张顺来说,编辑简单的用兵之法易,编制用炮之法难。他本身也是二把刀,虽然对如何编制炮兵,颇有心得。但是究竟如何用炮,还得请教专业人士。

为了以保万全,张顺特意前后请教了张都督、韩霖、高一志和颇具实践经验的李十安诸人。

张顺还不放心,又亲自前往曹文诏营地,像跟随曹文诏而来的炮手请教射击经验。

海纳百川,汲取众家之长,张顺才终于搞明白所谓的“炮术”究竟是怎么一回事儿。

炮兵作为张顺准备的“杀手锏”,不得不精心准备。为了确保万无一失,又不至于泄露出去,张顺干脆自己亲自操刀,编制炮兵手册。

火炮射击第一步,便是测距。火炮测距有目测和立杆二法。

中国传统方法为目测法,具体操作方法是先用尺子测量完标准距离,然后让观测之人观测站在相应距离上士卒的特征。

其特征对照口诀为:相距二十五丈,略见人眉目口鼻;相距五十丈,不见眉目,视彼人面赤;相距七十五丈,视彼人面赤转青白,身略朦。

相距九十丈,视彼人面蛇淡白而愈小;相距一百丈,视彼人面色微白,见面仅盈寸。

相距一百二十丈,视彼人面色只一点,似有似无;相距一百三十丈,视彼人面黑,身朦。

张顺心中估算了一下,一百三十丈也就差不多四百米开外。除此之外,身愈朦胧,距离越远,火炮便难以命中矣。

而立杆法,中西稍异,大体不过立上杆子,用三角函数法进行计算。

刚开始,张顺被炮手和韩霖、高一志诸人一顿子午、寅丑说的发懵。

过来好半天,张顺这才反应过来,感情这所谓的“子午寅丑”,就是类似“ABCD”的代号来着。

张顺前世高不成低不就,好歹九年义务教育的根子还在。难道连最简单的三角函数都不会吗?

遂后,张顺明白其中的关窍以后,顿时下笔如游龙,不到一炷香时间就把那些简单的三角函数计算题算了个明白。

这下子让张都督、韩霖和高一志大吃一惊。毕竟数学这种乏味的东西,并不是大多人能够轻易能够喜欢的起来。

那文渊阁大学士、内阁次辅徐光启徐阁老曾经和传教士利玛窦合力翻译了《几何原本》前六卷。虽然一时间名声大噪,众人争相传抄。

结果最终能够看明白的没有几个,更不要说进行深入研究了。

那韩霖身为徐光启的教友,自然也得入手一本。只看了半日,早已经浑浑噩噩,只得束之高阁作罢。

韩霖见张顺“喜欢”几何,为了天教传教大业,连忙推荐道:“主公既然喜欢这度数之学,我绛州家中尚且藏有徐阁老的《几何原本》,《勾股义》和《测量异同》等书。对了,还有《农政全书》《甘薯疏》《农遗杂疏》《农书草稿》《泰西水法》等农学着作;《选练百字诀》《选练条格》《练艺条格》《束伍条格》《形名条格》《火攻要略》《制火药法》兵法着作。”

韩霖突然间叽里呱啦说了一堆,张顺都没听清他说些什么。知道他听到《农政全书》,不由觉得耳熟,连忙问道:“哪个徐阁老?如今居于何处?”

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