正文 第40章 有烟瘾的铸炮奇才(第3页/共3页)
第一次鸦片战争后，林则徐被罚戍新疆，将《四洲志》全套资料留给了魏源。魏源在此基础上编成了《海国图志》。
这是一部划时代的巨著，全面、系统地介绍了世界各国的历史、科技、经济等知识。
只可惜，这本书在华夏无人问津。传入日本后，却风靡多年，多次翻印，极大地推动了日本明治维新运动。
《演炮图说》、《铸炮铁模图说》则是华夏火炮专家丁拱辰、龚振麟的著作，分别诞生于1841年、1842年。为了应付第一次鸦片战争，满清官府大量刊刻、翻印此书，分发各地铸炮备防。
杨烜借机考问道：“《海国图志》卷八十六《丁拱辰铸炮弹法》中讲道，中国与英国均用泥模法、失蜡法铸造火炮。人家都说你是火炮奇才，我且问你，为何英国人所铸大炮，远远胜于我国？”
这可难不倒周锋。他思索片刻，答道：“泥模在用炭火烘烤时，经常是外干内湿。浇铸铁水时，水分蒸成潮气，所铸火炮常有蜂窝状孔穴，发射时容易炸裂。
“洋人虽然也用泥模法、失蜡法铸炮，但他们炼出的铁水较为纯净，泥模、蜡模工艺先进，所铸之炮优于我国。
“不过，嘉兴县丞龚振麟发明了铁模铸炮法、复合结构铸炮法，工艺远优于泥模法、失蜡法。若大帅让我铸炮，我一定能用铁模铸炮法，造出比洋炮还要好的大炮。”
杨烜哈哈大笑，说道：“好！有志气！我再问你个问题。你可能不知道，英国人已经开始使用车床切削铸炮。所谓车床，是用蒸汽机带动的大型机器。
“英国人先用铁水冶炼出一根实心的铁柱，再用车床在铁柱中心钻孔，硬生生在实心铁柱上钻出一个炮管。这种火炮精度很高，坚固耐用，只需装入很少的火药，就能发射出很大的炮弹，实现较大的射程。
“这种方法，你会吗？”
车床切削铸炮，仍是现代火炮的制造方法。特别是高精度坦克炮，世界上只有中美俄德等少数几个国家能够制造。
这已经超出了周锋的认知范围，他有些惭愧，也有些不服气，却不知道该怎么辩解。 。
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