第263章 拖拉机（上）
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颜学义一行人在视察一圈帝国的重工业后，便返回四汌省，不过皇家一号飞艇没有降落在源河市，而是往南方飞出十多公里远，降落在永逸市。龙腾小说网ltxsba.com网
一行人在走出飞艇前，每一个人都带上了一个口罩。
带口罩已经成为源河市和永逸市两个地区独特的风景线，两座城市都是中华帝国的工业城市，两座城市的天空都是灰蒙蒙一片，这都是为了展工业而牺牲环境。
两座城市的空气质量非常差，颜学义整出口罩这种东西，很快便在两个城市流行开，反正口罩又不贵，两座城市中的居民都能买得起，接下来便看到，凡是走在两座城市大街上的人，几乎都面带口罩，不带口罩的人，多数都是新来的。
带着口罩的众人走下飞艇，飞艇附近早已经有几辆马车在等待着，众人纷纷进入马车中，马车向着永逸市西城区驶去。
“少爷，我们到底要去看什么好玩的东西？”坐在颜学义对面的慕雪拉着颜学义的手，讨好般的问道。
坐在颜学义身边常语欣没有说话，只是微笑的看着这一幕，已经贵为皇后的她，越来越雍容华贵，普通人根本不敢看常语欣。
颜学义看着慕雪这副可爱的模样，不为所动，曳对慕雪说道：“等我们到了那里就知道。”
永逸市的道路并不拥挤，马车很快来到一个巨大的厂区前，厂区大门上方挂着工厂的名字：永逸市拖拉机厂。
是的，颜学义此行就是来视察拖拉机厂。
拖拉机是用于牵引和驱动作业机械完成各项移动式作业的自走式动力机，也可做固定作业动力，由动机、传动、行走、转向、液压悬挂、动力输出、电器仪表、驾驶操纵及牵引等系统或装置组成，可以广泛用于农业、工业以及特殊用途。
自古以来，有很多人试图以机械力代替人力和畜力进行耕作。但直到19世纪欧洲进入蒸汽机时代后，才使动力型农业机械的诞生成为可能。
19世纪3o年代，已有人开始研究用蒸汽车辆牵引农机具进行田间作业。但当时所能造出的蒸汽机牵引车辆即蒸汽拖拉机的前身）犹如一个叙车头，它即使不陷在田里，也会把土压得很实，根本无法耕种。
1851年，英国的法拉斯和史密斯次用蒸汽机实现了农田机械耕作，只是当时他们的办法是把蒸汽机安放在田头，用钢丝绳远远地牵引在田里翻耕的犁铧。
后来随着蒸汽机制造技术的进步，出现了型化的蒸汽动机，把它安装在车辆底盘上驱动车轮行驶，使它能够从地头开进田地里直接牵引农机具，这才诞生了拖拉机，当时的拖拉机与早期的蒸汽机汽车很相似，但马咙大，行驶度较慢。
法国的阿拉巴尔特和美国伊利诺斯州的rc帕尔文分别在1856年和1873年明了最早的蒸汽动力拖拉机，只是最初的拖拉机笨重而昂贵，使用不便，往往需数人操作，适用于在广阔原野上耕作，一般个体农民难以负担。
在今年，美国芝加哥的查达动机公司制造出了世界上第一台使用汽油内燃机农用拖拉机——“巴加”号拖拉机，由于内燃机比较轻便，易于操作，而且工作效率高，它的出现为拖拉机的推广用打下了基础。
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