第667章 攻城利器（上）
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ps：12前还有一章，求推荐票
赵无恤让公输班带着工匠们制作的“秘密武器”，其实就是投石机，也称掷石车。
不过在这个时代，它在中国的名称是“飞石”。
大概在去年秋收后的农闲时，赵无恤唤来小公输班，继制作云梯后，又交给他一项任务。
“我听舟师的师帅徐承说起过，楚吴两国交战时，楚人为了守城，曾做出了一种机械：置石块于大木之上，飞石重十斤，可越过城墙，行百余步击敌”
当时公输班一愣：“的确是奇思妙想，这世上竟然还有这种利器”
有时候赵无恤不能不感慨，南方的楚国人脑子的确很聪明，弩和投石机都是春秋战国之交的楚地巧匠发明的，因为才在这时代崭露头角不久，所以北方工匠对此尚一无所知。
大概要到后来的吴越战争，以及更靠后的墨子时代，投石机才会在列国流传开来，不过赵无恤却要提前将这种攻守利器引入中原了。
他之前就有这种想法，因为征战天下，攻城守城是少不了的，而就算在大军事家孙武看来，攻城依然是极其困难的事情，正所谓“攻城为下”，统帅能避免就避免，所以战争才会旷日持久。
巧的是，从吴国讨要来的徐承也参加过吴楚战争，攻克一座顽抗的楚国城池后亲眼见过这种攻守机械，赵无恤让他凭着印象画出草图交给公输班，而公输班则一眼就看出了其中的原理。
“先建造投石机的架子，再用人力在远离投石机的地方一齐牵拉连在横杆上的梢，梢架在木架上，一端用绳索栓住容纳石弹的皮套，另一端系以许多条绳索让人力拉拽而将石弹抛出”
“这不是将军告诉过我的杠杆原理么”
赵无恤曾用秤给公输班讲述过这种初中物理知识：“秤的支到重物一端的距离称为本重臂，支到权一端的距离称为标力臂。当重物与权相等而衡器平衡时，加重物在衡器的一端，重物端必定下垂；如果在本短标长的衡器两端加上重量相等的物体。那么标端必下垂，这就是杠杆原理。”
仅仅靠着粗略的草图，以及简单的理论基础，公输班凭他的天分将投石机的精细部件一一制作出来。最终把楚人的发明容纳贯通，而且还在鲁国内做出成品，据说实验效果很不错。
但用于实战，这还是第一次
在之后的十多天里，赵军前阵持续不断地朝城中射箭、骚扰。让城内守卒疲惫惊惧。而后阵则成了一处大工地，五千劳役和一千兵卒被调派给了公输班，辎车全部任他使用。
公输班让两千人在西面的森林里伐木，顺着淇水将木材运送到朝歌，再拖拽上岸，由工匠指挥着另一批劳役风干加工。
要制造一台投石机，除了巨大的木梁之外，还需要大量的各种材料。一千人在东面的采石场采石，用牛拉人拖的辎车运回工地上堆放，然后又有一千人专门负责处理石头。
此外。鞣制或硝制的牛皮马皮、大车大车的绳索、攻城武器上需要的金属部件，纷纷在原地制作，或者从被征服的范氏城邑的府库中运出。
让公输班奇怪的是，除此之外，赵无恤还给了他不少竹子和纸张、锦布，让他抽空做些能高飞的风筝出来
公输班搞不明白，这种在鲁地渐渐流行开来的玩意，也能用在攻守城战里
他一拍脑袋：“莫非是要以风筝测风向风速方便瞄准”
赵无恤却神秘兮兮地笑了笑：“到时候你就知道了。”
日复一日，到七月上旬时，五十余台高达三丈的投石机并排矗立工地外的田野上。像是渐渐发黄的粟杆间站着一群巨兽。
赵无恤虽然不太懂木工和机械，但也听说过投石机分许多种：希腊那边有扭力投石机，后世还有什么离心投石机、配重投石机，尤其配重投石机。又称之为襄阳砲，是火炮诞生前最可怕的攻城利器。
不过就算公输班是天才，也没法在半年内就把人类花了一千多年的经验才臻至完美的器械一一作出。所以这次打造的，仍然是较原始的长杆式投掷器，也就是以人力拉拽发石。
它比南方楚吴等国用来守城的“飞石”要高上一倍，投掷臂由老树的树干制成。铁箍以防断裂，基架下有轮，可以沿着平坦的地面推动，调整攻击距离和角度。外观粗犷而富有木制机械的美感，威力也比南方的“飞石”要强，可以将十多斤重的石弹抛出两百步远
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