第362章 记里鼓车(1 / 2)

盛唐陌刀王 夜怀空 0 字 2021-09-25

李嗣业拽着下巴上的浅须淡定地说道:“记里鼓车你不必管,这个我自有方法。”

封常清狐疑地点头,心想李将军是在说大话吧,记里鼓车这东西除去皇城宫宦谁都没有见过,造化神奇更如巧夺天工,非张衡马钧等大家所不能为,一般人根本无法推导出其中结构,更别说再造一个了。

他将白绢背在身后,朝着李嗣业躬身叉手:“若将军没有别的事情,属下就先下去了,我先将地图的方寸用墨斗打出格子。”

李嗣业朝他摆了摆手,任由他转身离去,自己则开始低头沉思。

记里鼓车发明于东汉,相当于现代汽车的里程表,车轮转动通过齿轮传动的差动原理,构造复杂度还不如钟表,但整整领先了西方的一千七百年。传说是由张衡发明的,但没有明文记载。它的作用其实是用来当做天子的车舆銮驾,又称之为大章车,出行时排在指南车之后。

传说黄帝发明了指南车,自周代开始,天子出行时以指南车为先导,东汉时加入了记里鼓车,车中有掌车和史官负责记录天子起居注,之所以后来人看史书说某年某月某日天子出行,向东走了多少里,到达某个地方。这里面的里程数可不是估摸出来的,而是经过记里鼓车精确测量出来的。

难怪古人会称呼地图为舆图,这与帝王的车驾还是脱不开关系。

李嗣业默默盘算,唐里是以李世民的双步来计量,一步等于五唐尺,一里就是三百步。根据这个来制作鼓车的车轮,直径一步调整圆周率为三步多一点儿,这样车轮每转动一百下便是一里。在轮轴装上木齿轮,大轮周长咬齿为小轮十倍,然后在旁轴上再装一轮,仍然调整变速倍数,直至车轮转一百圈,最上面的齿轮转一圈。

这只是完成了基础构造,接下来还要装一个击鼓的装置,齿轮上装拨环用弓弦结构,使小人的鼓槌按在鼓面上,齿轮每转一圈就击鼓一下。当然这还不算,上面还要再加一个装置,当鼓声每敲击十下时,顶层的铙钹就会发生清脆的响声。

这样打造成的计里鼓车远比用脚丈量要精确得多,虽然依然无法解决地球曲率,还有海拔地势坡度问题,但已经很厉害了。从晋初直到明清,历代王朝的舆图都是按照这个方法理论来绘制。

他回到正堂中点了油灯,坐在案几前拿出一根细毫笔,在纸上写写画画,不断进行计算,费掉了几十张麻黄纸,才勾画车辆的整体结构和其他部分的图纸,勾画好尺寸。

等他伸了个懒腰长立而起时,不觉已是下午时分,但踌躇满志丝毫不觉得累,只想着尽快把实物搞出来。

十二娘进入堂中,看到地面上一团团的废纸,不由得哀怨地看了他一眼,低下身子将纸张捡起来。

李嗣业快步走到门口,燕小四正率领着亲兵在院子中清除杂草,修缮些破败的地方。

“小四。”

“来了,来了,喏。”

燕小四快步跑过来,站在台阶下叉手问道:“别搞卫生了,这地方能住就行,你带几个人到城中,把凡是会木匠手艺的人,都叫到镇使府上来。”

正在屋内的十二娘一听,不由得窃喜,李郎这是要准备为洞房做家具了,其实也没什么可做的,不过是弄一个木榻,两个胡床、妆奁、再去找工匠磨一个铜镜,用不着这样大费周章。

燕小四抬头看看天色,挠着幞头为难地说道:“现在就都叫过来,等把人都召集到一起,天可就黑了。”

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