第二百九十章 油浸麻布
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这一台纽卡门式蒸汽机，算是做出来了。
不过纽卡门式蒸汽机的效率十分低下，烧很多木柴才能产生有限的推力。这是因为冷却汽缸中水汽的同时还冷却了汽缸的缸体，然后过一会热蒸汽进来时候又加热了汽缸缸体，一来一回浪费了大量的热量。这样低效的蒸汽机显然不能满足李植的需求，李植要把这台纽卡门蒸汽机逐渐改造成瓦特蒸汽机。
瓦特对纽卡门蒸汽机最大的改善，就是冷凝器。有了冷凝器，汽缸缸体就不会被重复加热和冷却。
冷凝器其实就是一个大铁罐子，连接汽缸，里面有冷水。冷凝器的开关由机关控制，活塞被顶到最上面时候，开关打开，蒸气进入冷凝器中冷却成水。活塞落下落到底端时候，开关关上，蒸气无处可逃在汽缸中聚集，把活塞又往上推。
但是在做冷凝器的时候，李植现这冷凝器相对喷水冷却的办法需要更高的气压，到处漏气的管道中聚集不了这么高的气压，必须想办法堵住漏气的地方。
但是这年头没有耐高温的橡胶，李植想来想去，也没想到能用什么堵住漏气的管道。李植没办法，只能把市面上买得到的比较软的材料一一拿来试验。但各种纺织品都试了一遍，效果都不好。那看上去很滑很软的丝绸被高温蒸气一烧，都变得焦黑结块了。比较耐高温的材料是麻布，但麻布孔径较大，也没法堵住漏出的蒸气。
试验了好几天，李植还是没找到能堵住漏气的材料，李植有些被难住了。这瓦特式蒸汽机的原理是简单，但细节做起来还是很复杂的，即便一个细节没做好，也没法驱动整台蒸汽机运转起来。
说起来铜或者铅比较软，也经得住几百度的高温，难道要用铜和铅做管道接合处？这做起来倒是十分麻烦。
被李植调来做蒸汽机的一个年轻铁匠这些天看李植变戏法似的做出纽卡门式蒸汽机，对李植十分崇拜。此时他看到李植遇到难题，插了一句说道：“将军大人，若是把麻布浸在油里浸一天，麻布里面的孔径就会被油脂堵住，可能有用。”
李植愣了愣，倒是没想到还有这个办法。
他拍了拍年轻铁匠的脑袋，便按照这个铁匠的办法去操作。将油浸过的细麻布包裹在螺纹接口上再拧紧接口，重启蒸汽机。
这下子，李植现管道上不漏气了。
李植对那个年轻铁匠说道：“建议不错，赏你十两银子！”
那个年轻铁匠说一句话就赚了十两银子，大喜过望，笑得嘴巴几乎都咧到后脑勺去了。8
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