第325章 新式兵器
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马钧请刘璟进了船舱，在靠左边的舱壁边，刘璟看见了新的石炮，其实外形还是和从前一样，但从前的拉杆没有了，而是变成绞盘和一根长两丈的铜杆，这根细长的铜杆令刘璟忽然若有所悟，他想起了撬棒，顿时明白了上弦的原理。
旁边一名马钧的学生正在检修石炮，他给刘璟介绍道：“从前的石炮是用麻绳为弦，本身弹力不大，而我们这次用五股牛筋拧成弦，弹力极大。
但这样一来，上弦就需要用很大力气，如果再用从前的拉杆已经拉不开弦了，所以用了绞盘，但绞盘还不行，再加一很很长的青铜棒，这样上弦就毫不费力。”
说完，这名生徒亲自给刘璟示范，只见他从地上拾起铜棒，穿过绞空，慢慢向前推动，利用杠杆的原理，将绞盘吱嘎嘎转动了，弹力极大的弓弦也缓缓拉开，‘咔’的一声，弓弦挂上了悬刀。
生徒将铜棒抽出，又对刘璟笑道：“原来是用拉杆，需要两人同时后拉，而现在弹力增加了一倍，拉的距离也更远，却只要一个人就够了，就是这个小小的改进，使石炮的射程增加了五十余步，请州牧击射。”
他将一块十余斤重的圆石放在石槽内，刘璟当然知道怎么操作，他走到石炮旁，用脚一踩刀牙，只听‘崩！’的一声巨响，圆石被斜角向上弹射出去，船舱内嗡嗡作响，余劲未尽。
这种强大的劲力令刘璟赞叹不已，“不错，比原来的声势大多了。”
马钧上前笑道：“还是...有不足！”
“还有什么不足，先生说说看。”
“州牧没发现...用石炮守城，其实...无意义吗？”
马钧这句话说到刘璟心坎上去了，他当年参加多少次守城之战，石炮射程只有五十步，除了最后用来对付巢车，其实没有发挥任何作用，而且对付巢车的效果也不大，远不如投石机实用，确实是一种鸡肋。
“先生说得很对，可是该怎么改进呢？”
马钧笑道：“有点复杂，让我徒弟说。”
生徒行一礼，上前拍了拍石槽，“把这里改成铁兜，一兜三十支铁箭，或者改成大型弩箭，射程可达三百步，两百步内可洞穿一切盾牌和盔甲，是对付密集进攻以及对付骑兵的利器。”
刘璟听出他话中有内容，便笑问道：“你们试验过吗？”
生徒回头看了看马钧，马钧笑着点点头，生徒躬身道：“在匠学里有一架试验石炮，已试验过多次！”
刘璟心中大喜，立刻对众将道：“我们现在去匠学！”
.......
所谓匠学，顾名思义，就是培养工匠的学堂，这并不是刘璟的独创，在春秋战国时期，墨子和公输般都曾创建了这样的学堂，培养优秀的匠人。
江夏的匠学绝不是闭门造车，也没有什么理论课程，它事实上成为了发明创造者的集中之地，也成为了荆州的军器研究中心。
匠学又叫做公输院，以纪念战国时代伟大的匠祖公输般，位于夏口城西北角，占地五十亩，其中光试验场地便有四十亩之广。
马钧带着刘璟和几十名将领走进了弓弩堂，这里专门以研究弩箭为主，有生徒五十余名，由两名制弓、制弩近四十年的老工匠出任师父，马钧也参与了弓弩的研制。
弓弩堂后院的石墩上摆放着一架石炮，和船上改良后的石炮完全一样，但众人都发现了，石槽处改成了铁兜，铁兜内分成三十只格子，每只格子里插一支铁箭，每只铁箭长约一尺，锋利异常。
生徒继续介绍道：“我们把这个叫做铁弩炮，箭叫寒鸦箭，一兜三十箭。”
这时，旁边魏延好奇地问道：“真的可以两百步外洞穿一切吗？”
马钧一笑，“可以试验！”
他招招手，吩咐一声，几名徒弟立刻跑去布置了，刘璟望着这架铁弩炮，不知为什么，他忽然想起了诸葛亮的元戎之弩。
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