第895章 铜炮
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契丹人雄踞于燕云十六州，大周的河北、河南无险可守，耶律休哥分分钟可以带领十万甲骑，倾巢南下，坏了李中易的大局。
李中易想得通透，与其时刻担心耶律休哥南下，不如借用榆关之地利，水师之机动性，突然增兵榆关，打幽州的契丹人一个措手不及。
除了常驻于榆关的第一军之外，在水师的协助之下，李红易先后将二、三、五、四军调去了榆关。
等水师回转，李中易直属的骑兵营，以及近卫军的全部，也都要紧跟着北上榆关。
至于开京的防务，李中易还是按照老规矩，打算交给水师都指挥使周道中。
杨无双正想开口说话，却见一辆双马拖拽的古怪马车，从李中易身后的队伍里缓缓驶出，直奔礼成江畔。
李中易见杨无双出神的看着特制的双马拖车，不由翘起嘴角，信口问杨无双：“可知这是何物？”
杨无双从未见过如此怪异的马车，不过，他毕竟是参议司的代理主官，消息比碰人灵通得多，犹豫了片刻，迟疑的说：“莫非是那玩意搞成了？”
李云潇瞥了眼杨无双，他心想，军中的二杨，一个是李中易的门生，一个是掌握军令的参议司代理主将，还都是顶儿尖的聪明人，能够猜中李中易经过这么多年苦心搞出来的炮车大，并不足为奇。
没错，杨无双猜对了，眼前的双马拖车，其实就是李中易借用高丽国丰富的铜料，研制出来的火炮及拖车。
只可惜，借用泥模浇铸出来的铜炮，虽有三百余门之多，然而，大多数火炮的都存在各种具有安全隐患的裂纹，真正可以拿来礼成江畔实验威力的，只有十门而已。
至于，李中易一直惦记着的火绳枪，唉，不提也罢，投入进去的大量人力和物力，至今没个水花都没见响。
经过这么多年的摸索和实验，李中易对于火绳枪的念想，已经由期待变成了失望，又从失望改为灰心。
火绳枪最核心的部分其实是枪管。炼钢技术固然不成熟，倒也可以多花些时间精炼一炉好钢出来，只是成本高得惊人罢了。
要命的是，钻出一根合格的枪管，其难度完全超过了李中易的想象。
足够坚硬锋利的钻管工具，以及磨平内管的工具，这两项一直是摆在李中易面前，始终无法逾越的天堑！
火炮，由于发射的是铁球，其口径较大，找一帮十岁出头的，细胳膊细腿的小少年，倒也可以磨平内膛。
火绳枪管，实在是太细了，却没有合适的钻管及膛管工具，李中易只能一筹莫展。
李中易心里明白，在无法找到有效工具，并且无法生产合格枪管的如今，火绳枪只能在梦里惦记一下而已。
好在，高丽的储备铜不少，高丽人的冶金工艺却极其落后，根本不擅长利用铸钱，倒是便宜了李中易。
至于铸铜炮的人力成本，却是李中易最不需要担心的事情。从十几万高丽奴隶杂役中，精选出来的五百名精壮工匠，在皮鞭和钢刀的威慑下，帮着折腾铜炮的泥模，可谓是绰绰有余。
只要功夫深铁杵磨成针，如今三十比一的造炮效率，假以时日，必然会变成二十比一，甚至是十比一，乃至于五比一。
李中易望着正在卸炮的官兵们，注意力很快集中到了炮车轮轴上，心中感慨万千：战争还是真烧钱的游戏。
两千斤生铁炼成钢后，经过反复煅打揉炼，只得区区一根炮车的主轴。代价也是昂贵的，总共浪费了何止几十万斤生铁，才总算是找到了造出承重主轴的方法。
除此之外，炮车的轮毂，也是大费周折。经过反复的实验，近三百幅浇铸的铁制轮毂彻底报销之后，李中易才最终确定下来，轮毂的支撑幅数为十二根条幅。
万事开头难！
客观的说，造炮的成本很高，生产效率低，生产周期长。然而，哪怕低至半年时间才造出一架完整的炮车，却也比三年才得一张强弓，要强好几倍。
等官兵们架好炮，将炮口对准江心，填充好火药之后，众人在李中易的吩咐之下，全体躲避出去500米以上。
五名配备单筒望远镜的观察哨，按照李中易的事先嘱咐，散布在码头下边的江滩前，紧张的盯着江面。
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