第二百九十一章 五头牛
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解决了密封问题后，蒸汽机的后续改良就容易了，李植成功做出了冷凝器。更多小说ltxsba.com
冷凝器做出来后，那推杆上的力气明显大了不少。节约了浪费的热量，效果立竿见影。
接着便是做双向进气的汽缸，在活塞两侧的气缸上都开进气孔。当活塞左侧注入热蒸气做功时候，活塞另一侧就关闭进气孔连上冷凝器，从而产生负压吸活塞。活塞两边的气体一起用力，往一个方向推、吸活塞，提高输出的力量。
有了浸油麻布做启发，李植这次使用了浸油的麻绳给推杆和汽缸之间的连接部做密封，发现效果不错。麻绳浸了油后十分紧密，又有相当的弹性，因为油脂的关系摩擦力又小。在推杆上面绑上六层麻绳后，水蒸气就挤不出去了。
李植是在工匠的提醒下妙手偶得，想出了麻绳浸油的妙用。然而在李植穿越前的后世，实际上一直到十九世纪，英国还有许多蒸汽机是用浸油麻绳做密封的。英国的博物馆中在后世还保存着实物。
李植在两个进气孔上做了一个挡板。每次滑动挡板，两个进气孔便交替被打开和关闭，交替和锅炉联通。这个挡板由滑杆顶端连接的一个偏心环控制，随着滑杆的上下不断自动切换。
李植每天早上骑马到范家庄，晚上骑马赶回天津，在两地劳碌，又花了二十多天，解决了一系列小问题后，成功做出来了一台瓦特式蒸汽机。蒸汽机力气不小，起码有五头牛的力气。
看到李植做出了瓦特式蒸汽机，参加蒸汽机试制的铁匠们围着蒸汽机看个不停，啧啧称奇。
钢铁和火焰结合在一起，变成了可以动的东西，力气还这么大。匠人们虽然参加了试制，但他们都只参与了其中一部分的制造，此时依旧有很多地方没弄明白，对大都督李植的技术惊为天人。
“大都督，这力气比几头牛还大啊！”
“大都督太神了，这机器好多地方可以用啊！”
“大都督一定是鲁班转世！”
李植笑了笑，又对工匠们强调了一遍保密条例。
李植准备再依葫芦画瓢，做两个大些的蒸汽机，这样就可以装上船，成为船舶明轮的动力源。
有蒸汽机的船是轮船，无论什么季风时候都可以出海。用四季都可以出海的轮船做海洋贸易，李植仿佛已经看到大把的银子向自己挥手了。
不过李植的两艘大船还在制造，还要三个多月才能建好。
李植这些天抽空去王家湾看了看，教那些船匠搭建肋骨。那些船匠都是老把式了，一点就通，在龙骨两侧造起了密集的肋骨。除了铺设肋骨，李植还让船匠们在第二层甲板的侧舷开二十个炮口，作为大炮的射击口。
等三个月后尖头船造好，蒸汽机就可以上船了。
不过蒸气机能做的不止是船舶发动机，还能为许多工业提供动力。
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