第八百八十九章 风险测试（上）
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在两年前的太原防御战中，李延庆以充分的准备和震天雷的犀利歼灭攻城金兵四万余人，创造宋金战争中第一次大胜。网址找回邮件：ltxsba@gmail.com
后来王鼎接手太原防御，也沿袭了李延庆的防御思路，同样使金兵数月攻不下太原城，金兵也损失惨重。
金兵最后攻下太原城，还是在夜间偷袭，利用震天雷的威力炸开了城门，最终攻下太原城。
前车之鉴，李延庆不可不防，从仓库回来，李延庆随即来到太原军器场，这实际上是金国设立的兵甲打造中心，除了燕山府外，其次就是大名府和太原府各有一处。
在军器场干活的工匠约三百余人，都是从前的宋朝官方兵器匠，约四百余人，在这里打造刀枪，制作铠甲，宋军攻占太原后，这些军器匠又转而为宋军效力，只是更加卖力，整个军器场内热火朝天，一派生机勃勃的景象。
目前军器场由跟随李延庆大军前来的京兆火器监管事郝武负责，郝武就是郝二，他兄长叫做郝文，兄弟二人跟随李延庆多年，是制造和研发火器的核心人物。
“你兄长研发火铳的进展如何？”李延庆笑问道。
自从三年前李延庆将研发火铳的任务交给郝大后，郝大几乎整个心思都沉浸在火铳的研发上，失败了无数次，但他依旧锲而不舍。
郝武苦笑一声道：“上次都统提出用竹筒做铳身已经成功了，但实用性太差，最多两次就毁坏了，兄长还是决定用生铁或者熟铜来打造，火药已经成功，发火药可以利用震天雷的燃烧药替代，关键还是铳身的锻造，原本是采用两片半圆熔合成一个圆筒，但使用十几次后还是会开裂。”
“那为什么不采用震天雷砂模的办法，一次性浇铸铜管？”
震天雷的外壳就是一次性浇铸，先用粗砂做成内外两层模子，将铜水浇入两层模子之间，把砂模敲碎后，就能得到一个完整的震天雷外壳，这个技术已经成熟，临安府和京兆府的火药局每天都能做一百多个外壳，郝大郝二是震天雷的始创者，不可能不知道这个办法。
郝二解释道：“这个办法后来也用了，但做出的铜管外壳厚度不均匀，杂质也多，很容易炸膛，一名工匠的左眼就因此被炸瞎，所以现在又改用先平展锻造生铁片，反复锻造把杂质去除干净后，再弯曲成管状，接缝处浇上铁水熔合，不过想法是很好，但总会出现这样那样事先意想不到的问题，不过问题在不断解决，已经快要成功了。”
李延庆笑着点点头，“我很期待第一支火铳早日问世。”
两人说着，很快便走进了军器场，军器场占地足有两百亩，分为五座大院子，中间是总仓库，围着总仓库有五座工场，若从天空向下看，布局就像一朵五瓣花。
李延庆和郝文从弩院穿过，弩院内神臂弩和军弩都暂停制造，一百多名工匠正全力以赴制造投石机，宽阔的院子里整齐地摆放着四十架重型投石机的半成品。
做一架好的投石机至少要两年时间，工序就在抛杆的制作上，一般是用长长的竹片胶合而成，再用布细细裹缠三道，再浸透油晒干，反复十几次，，再刷十道油漆，再晒干，要耗时两年才能完成一根抛杆的制作，做成的杆韧性极好，很难折断。
不过庆幸的是，当初太原城的二百多架投石机被金兵下令销毁后，抛杆却被工匠们保留下来，现在只要用巨木搭个架子，装上抛杆就能使用了，几天时间就能完成上百架重型投石机的制作。
“孙匠头，现在有多少架投石机了？”郝武走上前笑着问一名老者道。
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