单兵利器的革命

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每发都是三钱二分,不用士兵自己量,绝不会炸膛;第三步,把剩下的纸壳连同里面的铅弹一起塞进枪管,用通条轻轻一推——纸壳能起到‘闭气’的作用,还能润滑枪管,让铅弹飞得更远!”
    他顿了顿,又指向纸筒底部的金属底火:“最关键的是这个!这是用铜片压制的小圆片,里面裹着硫磺、硝石和细炭粉,纸壳塞进枪管后,枪机击发时产生的冲击力会让底火瞬间引爆,进而点燃枪管里的***——相当于‘双重保险’,哪怕药锅里的火药受潮,底火也能把枪管里的***点燃,绝不会出现‘哑弹’!”
    负责制作火药的张师傅皱起眉头:“大人,这底火的防潮性得做好,要是在南方的梅雨季,硫磺硝石容易吸潮,到时候点不着怎么办?”
    “张师傅问得好!”林宇笑着回答,“咱们的底火外面要裹一层蜡,蜡是用蜂蜡和松脂按三比一的比例熬的,既能防潮,又能在击发时融化,不影响点火!而且每次****,都要抽样测试——把底火泡在水里半个时辰,捞出来还能点燃才算合格!”
    这话让张师傅放下了心,他拿起身边的火药勺,在手里比划着:“要是这样,那这纸壳弹可太方便了!以后士兵不用带药罐、弹袋,只要带一袋子纸壳弹就行,行军都轻便不少!”
    “光打得快还不够,还得打得准!”林宇的炭笔移向火铳的枪管,“你们看这枪管,不仅比寻常鸟铳长了两尺,内壁还刻了六条螺旋膛线!”
    他指着图纸上枪管的剖面图——里面画着六条均匀分布的螺旋线,从枪管尾部一直延伸到枪口:“这叫‘膛线’,也叫‘来复线’!铅弹塞进枪管后,会被膛线卡住,发射时,火药燃气推着铅弹沿着膛线旋转,就像陀螺一样,旋转的铅弹飞出后,弹道会特别稳定,不会像没膛线的鸟铳那样,弹丸飞得‘东倒西歪’!”
    王师傅立刻凑了过来,他手里还拿着细钢钻:“大人,这膛线的角度很关键!角度太陡,铅弹旋转太快,会浪费火药;角度太缓,旋转不够,弹道还是不稳!”
    “王师傅是行家!”林宇赞许地点头,“咱们的膛线是每转一圈前进三尺,这个角度是叶先生算过的——既能让铅弹有足够的旋转速度,又不会浪费太多火药,百步之外的误差能控制在三寸以内!”他顿了顿,又补充道,“而且枪管要用精铁打造,先锻打成圆钢,再用钻头钻通,最后用特制的膛线刀一点点刻出膛线,每一根枪管都要经过试射,弹丸能直线飞出五十步才算合格!”
    接着,林宇的手指抚过图纸上枪托的曲线:“这枪托是按咱们士兵的肩颈曲线设计的,不是随便做的!”他指着枪托的抵肩处,“这里宽三寸、厚一寸,里面垫了一层软木,能分散后坐力——以前的鸟铳后坐力大,打几发肩膀就青了,现在有了软木垫,打十发都不疼!”
    他又指向握把处:“握把这里有个凹陷,刚好能放下士兵的虎口,握起来特别稳;枪托尾部还有个小弧度,能贴紧士兵的脸颊,瞄准的时候不会晃!”说着,他模拟着持枪瞄准的动作,“你们看,这样抵肩、握把、贴脸,三点都能稳住,士兵瞄准的时候就不会因为枪身晃动而偏靶!”
    最后,林宇的炭笔落在枪管前端和后部:“枪管前端的准星是用黄铜做的,黄铜颜色亮,哪怕在阴天也能看清;枪管后部的照门是个V形凹槽,里面刻了细刻度,士兵只要把准星对准目标,再让照门的V形槽、准星、目标连成一条直线,扣下扳机就行!”
    他看向李老匠:“李叔,您以前是火铳手,要是有这准星照门,您觉得新兵多久能练会?”
    李老匠想了想,语气肯定地说:“以前的新兵得练三个月才能勉强打中五十步的靶子,有这准星照门,半个月!顶多半个月就能打中百步的靶子!”
    “没错!”林宇站直身体,目光灼灼地扫过全场,“这‘雷霆铳’,不是简单的‘改进火铳’,是单兵武器的革命!有了它,咱们的士兵不用再靠运气开枪,不用再怕雨天行军,不用再因为装弹慢而送命!鞑子的骑兵再快,也快不过每秒三百步的弹丸;鞑子的甲胄再厚,也扛不住咱们的穿甲铅弹!”
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