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    “试过没有?”林尘问。
    “试了三回。”刘文远推了推眼镜,手里拿着本厚厚的记录册,“第一回是空转,调试齿轮比;第二回上了麻线,但张力不均,断了几次;昨天第三回,用江南送来的上等棉纱,连续运转了两个时辰……”
    他翻开册子,念道,“八个纺锤同时工作,每个时辰可纺纱三斤四两,是人力纺车的……十六倍。”
    屋里响起一片倒抽凉气的声音。
    跟着林尘来的户部侍郎关宁,原本只是好奇旁观,此刻瞪大了眼:“十六倍?!”
    “若只算单个纺锤,效率是人力纺车的两倍。”
    刘文远认真解释,“但人力纺车一人只能管一台,而这机器,理论上一个工人可以照看四到六台——那就是八到十二倍的效率。实际上因为要添料、接线、处理断头,但即便保守算,五六倍是稳稳的。”
    关宁张了张嘴,没说出话来。他是管钱粮的,太明白这意味着什么。大奉每年要从江南、湖广调运大量棉布麻布,光运费就是笔巨款。若能在京师附近建起这样的工坊,甚至若是在江南省建造这样的工坊,那江南省可就要变天了!
    林尘已经走到机器前:“现在演示一遍。”
    王铁锤重重点头,朝徒弟们一挥手。炉火早已生好,锅炉里的水正咕嘟作响。阀门打开,蒸汽涌入气缸,飞轮开始转动。
    “咔嗒……咔嗒……咔嗒……”
    齿轮咬合的声音清脆而有节奏。连杆开始往复摆动,带动那排铜制凸轮旋转。凸轮的曲线推动着引纱钩,棉纱从纱锭上被引出,经过加捻轮,又均匀地卷绕到下方的纱管上。
    八个纺锤,同时工作。
    棉纱如流水般被抽出、加捻、卷绕,纱管渐渐丰满。机器运转平稳,除了蒸汽喷涌的“嘶嘶”声和齿轮的“咔嗒”声,几乎没有杂音。阳光从高窗射进来,照在旋转的纱锭上,棉纱反射着柔和的光,像八条流动的银线。
    林尘静静看着。前世在历史课本上看过的图片,此刻成了眼前的现实。蒸汽的力量通过齿轮和连杆,转化成纺织的动作。
    简单,重复,却不知疲倦。
    半个时辰后,机器停下。
    八个纱管全满了,棉纱均匀紧密,捻度一致。王铁锤捧起一个纱管递给林尘,手有些抖:“校长,您看……这纱,比江南老师傅手纺的也不差。”
    林尘接过,手指捻了捻纱线。手感柔韧,粗细均匀。他抬头看向屋里的人,王铁锤和徒弟们满脸油污,眼睛却亮得吓人;刘文远抱着记录册,嘴唇抿得紧紧的;程亮祭酒站在门口,扶着门框,眼眶竟有些发红。
    “好。”林尘只说了一个字。
    但这个字,让所有人都长舒了一口气,随即,笑容在每张疲惫的脸上绽开。
    “不过还能改进。”林尘放下纱管,走到机器前,指着引纱机构,“这里的凸轮曲线可以再优化,减少空行程;纺锤的转速可以分级,适应不同纱线;还有断线自停装置。纱一断,机器能自动停下,免得浪费原料。”
    刘文远立刻掏出炭笔,在记录册上疾书。
    “这些慢慢来。”林尘转身,看向关宁,“关大人,您看这东西,如何?”
    关宁咽了口唾沫,声音有些干涩:“下官……下官得算笔账。”
    他从袖中掏出个小算盘,当场噼里啪啦打起来,“一台机器,八个纺锤,一个时辰纺三斤四两纱,一天开工六个时辰,就是二十斤纱。江南熟练女工,一天最多纺一斤半。这一台机器,抵十三个半人。”
    他抬起头,眼神已经变了:“若是一个工坊摆上五十台机器,那就是六百多人的产量!但照看机器的工人,可能只要一百人!”
    “不止。”林尘补充,“机器不用吃饭睡觉,不用生病请假,刮风下雨都能干。而且纺出的纱均匀,织出的布质量稳定,能卖出更高的价。”
    关宁的手指在算盘上顿了顿,然后猛地抬头:“林大人!这工坊,得建!必须建!”
    “地方我已经想好了。”林尘走到窗前,望向西方,“煤炭镇。”
    关宁一愣:“京师西边那个……挖煤的镇子?”
    “对。”林尘转身,“煤炭镇在景山和京师之间,景山的煤矿,煤都在那里做成蜂窝煤,供应京师。蒸汽机烧的就是煤,把纺织工坊建在产煤地边上,省了运煤的损耗和运费。而且煤炭镇有现成的水源。蒸汽机需要大量水,那里有条河。”
    他顿了顿,继续道:“再者,煤炭镇多是矿工家眷,妇人孩子多,劳力便宜。建了工坊,既能吸纳闲散劳力,又能让矿工家庭多一份收入,安定地方。”
    关宁听得连连点头,心里飞快地盘算。煤价、水费、人工、运输……每一项都能省下银子。他看着那台还在微微冒着余汽的机器,仿佛看到了白花花的银子正从纺锤里流出来。
    “那下官这就去协调地皮
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