第一千五十九章 后装炮
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这种密封方式和十九世纪晚期的克虏伯后装炮密封方式是原理一样的。它比英式的阿姆斯特朗后装炮巧妙一些，加工的难度也低一些。
当然实际的克虏伯炮的科技水平更高一些，炮栓的结构更复杂。李植觉得以现在天津的工业水平，发展克虏伯炮还不成熟。
而使用曹余的这种简单密封方式，后装炮可以实现相当程度的密封。
后装炮的发展也是逐渐前进的，并不是一蹴而就。实际上明末广泛使用的弗朗机炮也是一种颇实用的后装炮，当然这种炮密封性较差，射程有限。
李植又点了点头，问道：”怎么击发呢？“
曹余用手指着炮尾的一个小洞说道：“我们还是使用雷酸贡做击发药。我们把雷汞和黑火药做成了一个管状击发药筒。开火的时候将这个药筒插在击发孔上，一拉击发绳，雷汞点燃黑火药，就把炮管内的发射药点燃了。”
李植挥手说道：”射一发试试！“
曹余大喊得令，和几个炮兵一起打开了炮管，将锥形的铅弹和袋装的黑火药塞进了炮尾。然后曹余将卡栓插进了炮尾的洞口，旋转转柄将炮尾密封起来。同时另一个炮手装上了击发火药筒。
”三！“
”二！“
”一！“
”开火！“
”轰“一声，这门小炮向靶区喷出了火舌。炮尾喷出了巨大的白色烟雾，让李植的视线受到很大的阻碍。
李植往旁边走了几步，透过烟雾看了看，发现一百米外的靶子被击倒了。
李植说道：”打更远的目标试试！“
曹余和炮手们赶紧调整炮口，又开始装弹上药。
在三个炮手的配合下，这门六磅的小炮大概每十五秒就能完成一次装弹，速度明显强于前装炮。
火炮向更远的靶子开火，命中率相当的可观。这后装炮内部同样有膛线，在精度上没有什么问题。最远可以打三里外的目标。
李植观察着后装炮，琢磨了一会。
”有些漏气…“
曹余摸了摸脑袋说道：”王爷，多多少少有一点点漏气，但是我们会想办法改进的。“
李植说道：”不过你们可以先把这种炮装到坦克上去。我们的坦克现在还没有攻击性武器，急需要你们的后装炮装备。“
曹余听到这话，眼睛一亮。
”王爷，这么说我们的后装炮能用？“
李植笑了笑，说道：”勉强能用，先凑合着用吧。就叫曹氏后装炮。“
”参与研制的工匠每人赏银子一百两。领导赏二百两。曹余赏五百两。要是气密性以后得到改进，还有更多的重赏！“
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