第539章:马钧巧思造水转
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长安西市最偏僻的一角,原本是朝廷堆放废旧兵器的库院,半年前被划给了太常寺属下一个名不见经传的小衙门——“工巧署“。署中只有三名官吏,主事者是一个年过五旬、双手布满老茧和烫伤的干瘦老者,名叫马钧。
此人平日里沉默寡言,遇人说话总是慢吞吞的,仿佛每吐一个字都要在心里先称过三遍重量。朝中知道这个名字的人不多,但若论“巧思“,马钧若是认第二,天下无人敢认第一。翻车、指南车、连弩改良,他独力一人让这些器物脱胎换骨。
但真正让他彻夜难眠的,是半月前那份忽然下达的密诏。
密诏是刘封亲笔写的,措辞简练——“马卿:朕闻水转百戏、轮翻车机,卿之巧思冠绝当世。今天下水利大兴,关中渠堰岁修,然人力耗时过甚。卿可试制以水力代人力之器,先成者报尚书省,不拘资费。“
马钧捧着那道诏书在工坊里枯坐了一整夜。他做过翻车,那是人力踩踏引水;他做过指南车,那是齿轮拨动定向。但“以水力代人力“——水势无常,忽急忽缓,要让水流转变成均匀的机械力道,让笨重的水轮驱动石碓、磨盘、冶炉鼓风囊——这是前人从未做到的事。
“马大人,第三根轴又断了!“
学徒小周的喊声将他从思绪中拽回。马钧快步走到试验台前,那架一人多高的木制水轮静静立在水渠旁,引水闸门已经放下,浊流冲击着轮叶,轮轴却纹丝不动。马钧俯身查看断裂处——木轴从中间裂开了一条大口子,裂纹扭曲如蛇,分明是受力不均导致的扭断。
“齿轮咬合偏了三分。“他蹲下来用手指蘸水抹在轮毂齿槽里,看了半晌,“左侧受力比右侧重了太多,水轮转起来只扭一边,轴撑不住。“
小周愁眉苦脸:“已经是第三根了。库里的硬木全用光了,再去调只怕要报给尚书省……“
“去东市,买榆木。“马钧起身拍了拍手上的木屑,“硬木太脆,受力大就崩。榆木韧性好,宁弯不断。再买三丈麻绳、五斤桐油回来。“
小周应声跑出去了,马钧独自站在那架半成品水轮前,眯着那双被炭火和木屑熏了大半辈子的眼睛,盯着轮叶入水角度一言不发。水渠是从灞河引来的支流,流速尚可,但水轮的叶片吃水太浅,吃水太深又会拖慢转速。这中间的尺度,他在小模型上反复算过,可放大了十倍之后,那些计算全都不作数了。
“吃水深一分,轮力加三分,但转速减四分。“他喃喃自语,“水深、流速、叶片倾角、轴径粗细、齿轮齿数……五样东西缠在一起,一动全动。“
正心烦间,工坊门外忽然传来一阵脚步声。马钧抬头望去,只见裴秀裹着一件半旧墨绿大氅走进来,身后还跟着两个年轻官吏,一人手中捧着一卷帛图,一人抱着厚厚一摞竹简。
“德衡,“裴秀进门便直奔水轮而去,上下打量了一番,“听说你忙了半个月还没成?“
马钧苦笑:“仲治公莫要取笑。这东西看似简单,实则比翻车难做十倍。水力不似人力,想停就停,想快就快。水大了轮飞,水小了轮滞。我试了七种叶片形制,三种轮径,五种轴材,搭起来的架子拆了又拆,还是差一口气。“
裴秀没有多话,示意身后两个年轻人将帛图和竹简在案上摊开。马钧凑过去一看,瞳孔微微一缩——那是一份极精细的灞河上游水势观测记录,字迹密密麻麻,标注了不同月份、不同时辰的水位涨落和流速变化。帛图上则画着关中主要渠道的走向,每一条渠旁都标了实测的坡度和流量。
“你这份水势图——“马钧转头看向裴秀。
“制图司新测的。“裴秀捻须微笑,“你造水转,不能只凭手感和运气。要知哪条渠的水常年不断、哪条渠冬季枯浅,要知落差多大、流量几何,才能定下你的轮径齿数。我这图是山川地貌,你那些数据若不填进去,就是聋子听琴。“
马钧怔住了。他这半个月苦思不得的,正是一个“数据“的问题。他每一次改动叶片或齿轮,都只能靠试错——装上、转、断、拆、重做。若是能提前知道水势的准确参数,把计算先做在纸上,至少能省掉一半的弯路。
“仲治公,“马钧忽然一把抓住裴秀手臂,“你这份水势观测能借我誊抄一份么?还有,你制图司里那些会算学的人——“
“早给你带来了。“裴秀侧身指了指身后两个年轻人,“这是卫玠,你见过的。这是他师弟王朗,精于算学,尤善比例算法。你只管告诉他们你想算什么。“
卫玠上前一步,双手将一卷空白的麻纸展开铺在案上,又从袖中摸出炭笔:“马大人,您说,我记。“
马钧深吸一口气,在轮轴旁边蹲下来,用木炭在地上画了三个圈:“水轮,齿轮,磨盘。三个东西。水轮转一圈,齿轮要转三圈,磨盘要转五圈。这是最简单的倍数关系。但问题是——水轮每秒转多少圈,由水势和叶片吃水共同决定。水势你帮我算,吃水深度我试给你看。我们一个个参数定。“
卫玠运笔如飞,一边记录一边追问:“水轮半径?叶片数?入水角度?“
“半径七尺,叶片十二片,角度我还没定——“
“那就定十二个方案,“王朗在一旁接过话头,“每一度作为一个方案,算出每种方案的转速与力矩,取其中最优。“
马钧猛地抬头,看着这两个二十出头的年轻人,一时竟不知说什么。他做了一辈子器物,从来都是刀砍斧凿、边做边改。而今有人告诉他——可以先在纸上算清楚再做,这份冲击不亚于他当年第一次见到齿轮传动时的震动。
“好。“马钧重重拍了一下大腿,“那就从入水角度开始算!小周!把架子拆了重新搭,按照纸上算出来的方案走!“
整整三天三夜,工巧署的灯火没有熄过。卫玠和王朗轮流执笔,将每一步计算写在麻纸上。马钧则根据计算结果搭建试验模型,每一次拆装都精确到寸,不再凭手感估摸。第四日清晨,霜重露寒,新的水轮终于重新装入水渠。
马钧亲手提起闸门。
灞河支流的清水涌入渠道,冲上轮叶。这一次入水角度经过了精确计算,轮叶吃水深浅恰好落在最优区间。水轮先是微微一滞,随即缓缓转动起来,起初慢,渐渐加速,轴上的榉木齿轮发出低沉而均匀的嘎吱声,传递到第二轴、第三轴,最终牵动磨盘上方的石碓——那块两百斤重的青石碓头被稳稳托起、落下,砰地一声砸在石臼里,随即又是第二下。
砰。砰。砰。砰。
节奏均匀如鼓点,一下不多,一下不少。
马钧站在水轮旁,看着那架巨大的木头器械在清水的推动下不紧不慢地运转着,双手微微发抖。那十二片榆木轮叶沾着细碎的水珠,在晨光中闪闪发亮,每一次入水都精准地切入最优角度,不偏不倚。
“成了。“他嗓子哑得几乎说不出话。
裴秀不知何时已经站在了他身后,拍了拍他的肩膀:“德衡,你这不是成了一架水转磨盘——你这是在关中每一条河渠边上,都埋下了不吃饭不歇息的长工。“
消息传入太极殿时已是晌午。
刘封放下那封来自工巧署的奏报,奏报上字迹凌乱,显然是马钧亲手所写,末尾附了卫玠和王朗一同署名的计算方案。他看了三遍,将奏报递给身旁的杜预。
杜预看完,深吸一口气:“陛下,若此物能在关中推广,每处水磨可省二十个劳力。渭河两岸可设数百处,那就是数千人从磨坊里解放出来去开荒屯田。而冶铁作坊若装水转鼓风,炉温更稳,铁质更好,军器刀剑的产量至少翻一番。“
刘封没接话。他起身走到殿侧,那里摆着一张宽大的舆图,正是裴秀新制那幅关中全境图。他伸手指着渭河沿岸那些标明“可设水转“的位置,指尖在图上划出一道长长的弧线。
“杜卿,传旨下去——工巧署升格为工部下属‘水转司‘,马钧任司丞,秩六百石。调卫玠、王朗入司协助。另外,通令各州郡凡有渠堰之处,皆报水势实测至尚书省,由水转司统一规划设置。所需费用从今年盐铁专营结余中支取。“
杜预躬身领旨,转身刚走两步,又被叫住。
“还有——“刘封从袖中摸出那枚青铜打火机,在指尖翻了个面,“传话给马钧,让他别只盯着磨盘和冶炉。朕还想要一种靠水力拉动纺车的东西。布帛之事,也是国本。“
杜预走后,偏殿安静下来。刘封重新走到那幅关中舆图前,视线落在渭河沿岸那一排排代表水转可能位置的朱砂圈上。他想起穿越前在博物馆里见过的水转大纺车图片,三十六个锭子同时转动,一个水轮抵得上百名女工日夜不停。
步子要一步步走,但他知道脚下的方向是对的。
窗外的日头正西移,将太极殿的重檐影子拉得老长。刘封收回目光,低头看着掌心那枚已经磨得光滑锃亮的青铜打火机,轻轻将它扣在了舆图上——恰好按在渭河与灞河交汇处,那里有一个新的朱砂圈,旁边用小字标着:灞桥水转试制处。
(第539章完)
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