第353章 新想法

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里那堆新运到的铁料前面查看成色,听到马蹄声抬起头,看到李默翻身下马,手里攥着一卷纸,连忙在裤腿上蹭了蹭手上的灰迎了上去。
    “殿下,您这是……“
    “有新东西给你看。“李默走进工棚,把纸卷在长桌上展开。
    张衡凑过来低头看了好一会儿。
    炭笔的线条虽然粗略,但每个部件之间的连接关系都画得清清楚楚,锅炉在上、气缸在侧、连杆居中、桨轴在后,像一条被拆开的铁蛇,零件逐一摊开,拼合之后又能重新游动起来。
    他看了很久才抬起头,脸上的表情带着一种“这又是什么“的愣怔:“殿下,这东西……不用人划桨?“
    “不用。烧水,蒸汽推活塞,活塞带动桨轴,船自己走。“
    张衡的目光在纸上又停了好一会儿,张了张嘴想说什么,又闭上了,像是在肚子里反复掂量了几遍才终于开口:“殿下……您说,这个叫蒸什么来着?“
    “蒸汽机。“
    “蒸汽机……“张衡把这几个字在舌尖上含了一会儿,咽了下去,又低头看了一遍图纸上的连接线,“殿下,这玩意儿……得用铁铸吧?“
    “嗯,锅炉和气缸用生铁铸,活塞杆用熟铁锻,桨轴用钢。“
    张衡又蹲回图纸前面,目光追着那根从气缸伸向船尾的长轴走了一趟,眉头皱了一下:“殿下,这个做起来可能会很困难。”
    “我知道,不过,再难也要做出来,只要做出来,咱们大唐,华夏就不会落后…”
    李默说了一句张衡听不懂的话。
    张衡没有再追问,蹲在桌边,从袖子里掏出一截炭笔,在图纸的空白处加了一行小字:“铁件尺寸须精确,装配间隙不可过大。“
    字迹工整认真,像是在替自己的疑问做最后的注脚。
    他又看了好一会儿才站起来:“殿下,这活儿臣接不了。“
    他顿了顿,像是在斟酌措辞,“不是不想接,是臣没那个手艺,铁的活儿能找人打,但那根长轴……得磨得极光溜才行,臣认识的人里,没有能磨那么准的。“
    “你认识的人里没有,但有人有。“李默把图纸卷好,“长安城外十里铺的马铁头,他在潼关干过十几年军械监造。“
    张衡的眉头松开了:“马师傅,臣知道,他以前是管兵部军械监的,打刀枪铠甲的手艺在长安城数一数二,臣见过他打的弩机,零件互换都严丝合缝,连半丝误差都没有。只是他年纪大了,前两年已经不大接活了。“
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    “我去找他。“
    李默没有在工部衙门多待,卷好图纸翻身上马,沿着水泥路往十里铺方向走。
    天气比早上又冷了一些,路面上结了一层薄薄的白霜,马蹄踩上去有些打滑,黑马放慢了速度,不紧不慢地走。
    路边田里的麦苗已经长出了三四寸高,绿油油的,在灰白的天色里格外显眼,像是在灰扑扑的底布上绣了一排嫩绿的针脚。
    十里铺铁匠铺子的炉火还没熄,大老远就能听到里面传来的敲打声,铛铛铛的,节奏匀称,像是在敲一首只有铁匠才听得懂的曲子。
    马铁头正蹲在炉前夹着一块烧红的铁料往砧上放,听到门口有人进来,抬起头看到是李默,先是一愣,随即连忙放下铁钳在围裙上蹭了蹭手,脸上浮起一层笑纹,像被热铁熨过的旧麻布,虽然硬但确实平整:“殿下!您怎么来了?快坐快坐,草民这刚打了一把锄头,还没淬火呢。“
    “不打锄头。“李默在长凳上坐下,把纸卷打开铺在旁边那块平整的木板上,“想让你打点别的东西。“
    马铁头凑过来,眯着眼看了好一会儿。他的眉头先是皱着,然后慢慢松开,又皱起来,像是在心里把那些线条和构件立体化了一遍,最后他蹲下来,用手指沿着那根长轴的轮廓虚虚划了一道:“殿下,这东西……铁芯的?“
    “铁芯的,外面包一层钢皮,中间是空的,要磨得极光,不然活塞过不去。“
    “活塞又是什么?“
    李默指了指气缸剖面图里那个圆柱体说道:“这个,在气缸里来回推动,密封要好,不能漏气。“
    马铁头蹲在图纸前面,沉默了好一阵子。
    炉膛里的火光映在他侧脸上,把他满手的锈渍和那道横贯手掌的刀疤照得忽明忽暗,像一条被火光反复描过的伤疤。
    “殿下,这活儿草民可以试试。“他终于开口了,声音比平时低了几分,“但草民得先把炉子改一改,现在的炉温不够,铸铁水灌不了这么复杂的模,得重新砌一座大一点的炉子,还要找一批好铁料,南方的生铁不行,杂质太多,得用荆襄那边的铁矿石炼的,那玩意儿纯。“
    “需要多久?“
    “砌炉子半个月,化铁浇模又得十天半个月,若是浇坏了还得重来,快的话两个
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