第149章 大显身手!

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微笑,幸福又甜蜜。
    中午,几个石匠大师傅被叶坤留了下来,一起吃擀面。
    还有老何,也被请来了。
    叶坤向石匠们道谢,又道:
    “大家继续做石磨,还有石头磙子,还有石臼和臼锤。图纸我都给你们了,你们根据实际情况,可以大胆调整,以实用为最终目标。”
    石匠们纷纷起身道谢:“叶大人抬举我们,我们一定用心用力!”
    “都坐下,不必多礼。”
    叶坤一笑,把图纸递给老何:“老何,你看上面的石头磙子,一头大一头小,都有尺寸标注。你知道,这样的磙子,有多重吗?”
    老何又懵逼了,苦笑道:“叶大人,这个没有大秤,是看不出来的。”
    “可以算出来的。”叶坤指着图纸:
    “圆柱体的体积,我教过你了。先算出石头磙子的体积,再乘以比重,就是实际重量。石头的比重,以水为基准,一般在2.6到之间。我们取一个中间值,大约是2.7。所以,图上的石头磙子,重量大约三百五十斤。”
    几个老石匠也看看图纸,佩服得五体投地:“叶大人说的很对,这样的磙子,就在三百五十斤上下!”
    老何抱拳拜服:“叶大人学究天人,学究天人啊!”
    “别别别,我再教你一些物体的比重,你记住,以后都会用得上。”
    叶坤摆摆手,拿起毛笔:“黄金,是水的倍;白银,比重10.6;铜,8.7;铁,7.8;水银……”
    这些东西,都是后世初中知识,现成的知识点。
    但是大鼎国的人,算不到这么精确。
    老何已经被这一串数字惊呆了,良久才问道:“叶大人,这是……怎么算出来的?”
    “你先记住就行,这些数字是固定的,永远不会变;怎么算出来的,以后再说。”
    叶坤端起碗:“来来来,大家多吃点,吃饱了好干活。”
    饭后,木匠作坊,又送来五十个算盘。
    这是后世的滚珠算盘,也算是当时最先进的计算器。
    叶坤带着老何,直奔学堂,召集精英班,开始讲课,教大家认识自己的算盘。
    老何也坐在下面听课,还有文阿秀和红玉,还有何田田。
    叶坤笑道:
    “各位同学,我们的老祖先记账算账,一开始是结绳记事。借你家一个鸡蛋,就在麻绳上打一个结。后来变聪明了,有了算筹,用小木棍来计数算账。所以有句话,叫做运筹帷幄之中。如果算账算不出,就叫一筹莫展。”
    同学们都嘻嘻一笑,觉得叶坤讲得有趣。
    叶坤继续说道:“到现在,我们大鼎国有了算盘,叫做游珠算盘,在木板上刻上许多直槽,直槽里放上小圆珠。但是这玩意不好用,所以,我做了分档滚珠算盘,可以随身携带,个十百千万,不会错乱……”
    文阿秀和刘红玉起身,把算盘发给大家。
    叶坤叫来老何,继续讲解算盘,先教大家加法口诀,然后让老何负责教会大家。
    老何是真聪明,对照加法口诀,把算盘打得噼啪作响。
    叶坤完成了任务,离开学堂,又去巡查军营。
    一连几天,叶坤都忙得要死。
    白天处理军务政务,晚上经常加班,带着文阿秀刘红玉和老何,制定面向精英班的数学、几何教材。
    老何原本两眼无光,现在却越来越精神,容光焕发!
    叶坤觉得,如果一直把老何带在身边,一年之内,这家伙能学会高等数学,能理解万有引力,能计算引力常数。
    正月十七。
    天门郡飞马急报,送来上官季夫的密信。
    信中,上官季夫说,东巴郡郡守刘栋梁,已经答应了他的要求,同意叶坤跨境剿匪,并且派出三千精锐,从西向东扫荡,配合叶坤!
    叶坤大喜过望,立刻召集秦二午、关勇赵彪等人开会。
    大家都知道叶坤有所行动,却不知道具体目标。
    叶坤说道:“各位兄弟,养兵千日用兵一时。冬去春来,你我兄弟大显身手的机会到了!”
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