第835章 可能与世作津梁(下)
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第835章可能与世作津梁(下)
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说是接风宴,但韩冈和沈括在席上都没怎么喝酒。
酒宴过后,韩冈一行便被安排到了寅宾馆住下。沈括则是前面领路,将韩冈请到了后堂中。
一进大厅,就看见了一幅六尺见方的沙盘模型。
韩冈不以为异,沈括主持制作的熙河路沙盘,比起自己当年所制作的旧型,要精确了许多,在测绘测量上,沈括的水平远比韩冈要强,沈括到了唐州后,当然也不会把自己的特长给丢掉。只是走进了才发现,沈括制作的这幅沙盘,比他预计得还要好。
这是一幅是以襄汉漕渠为中心,将方城山附近的地理地形塑造出来的沙盘模型。比例尺、经纬线、图示、方位标识,后世地图该有的标识,一切都不缺——其中有韩冈的功劳,但更多的还是沈括的天才——不过最重要的是,这副沙盘,跟韩冈在京城的时候所看到的唐州地图并不一样,有很大的区别。除去精细度的问题,主要就是山区等难以通行的崎岖地带的面积收窄,而平原面积放大。
“这是以飞鸟图为本吧?”
沈括很是自得的点着头:“正是飞鸟图。”
飞鸟图是沈括所提倡的制图法。所谓飞鸟图,顾名思义就是仿鸟飞直线所绘制的地图,排出地形地貌的干扰。
过去的地图是受到地形地貌的影响,许多时候会参照实际行程而来,越是难行的地方,就会有越大的误差。这一点当然有问题,在山区,一天三五十里,到了平原上,百里也很寻常,所以绘制出来的地图与实际地形有着很大的差异。但日常使用起来反而效果不差。毕竟此时的地图,多用来指挥行军,参考地图能确定实际的行程日期。
如今沈括绘制制作地图和沙盘所使用的飞鸟图,图上的距离如空中鸟飞直达,排除地貌所引起的距离误差,用后世的话说是实际地形垂直投影到平面上的距离。这一制图法究竟是谁发明的现在是说不清了,但出自于制图六体——晋代裴秀所确定的‘分率、准望、道里、高下、方邪、迂直’这制图六原则——是毫无疑问的。韩冈是沈括自制作熙河路的地图和沙盘开始,才第一次看到。而能制作出飞鸟图,并以此来制作沙盘,其实是测量仪器和手法上了一个台阶后的结果。
不过眼前的这幅唐州地理,比起前两年的水平更进了一步,韩冈指着沙盘问着:“比旧时精确多了。存中,你是不是又有什么发明?”
“的确。”沈括自负的点点头,“前些日子为了测量唐州的山势、水程的高下,以及道路远近,愚兄将经纬仪和测距仪又改进了一番……只是时间太短,只能匆匆而就。若是再给愚兄两年,唐州的山水便能尽在图上。”
“可惜存中兄不一定能有两年时间。”韩冈笑道,“一旦襄汉漕运打通,区区唐州又岂是待贤之所?”
韩冈说得好听,其实就是要让沈括卖命,但沈括听得也高兴,要不是为了将功赎罪,去江南不比唐州更好?
韩冈与沈括共事的时间并不长,两人的交情就是依靠对自然科学的共同兴趣而逐渐发展起来的。相对而言,韩冈是刻意而为,沈括就是出自本心了,一说起机械构造时,立刻就变得滔滔不绝起来。
沙盘模型还算是正常,但沈括接下来展示给韩冈的却是让人瞠目结舌。
——竟然是多级船闸的模型。不是放在后堂中,而是砌在州衙的后花园中,架在从外面引来的一道活水上。整座船闸模型有一人髙,从高到低分了五级,船闸的闸门开合启闭都可以通过绞盘来实现。而船闸中的流水是靠着一架小水车来提供。
沈括一声令下,用人力推动的小水车就哗哗的将水提到船闸的最上端,让清澈的水流从自上流淌,船闸上的闸门在绞盘的控制下依次打开,让一艘小小的木船模型,沿着船闸通道,从最低处的水面一直上溯到近一人高的最上层。
沈括指着船闸模型,对韩冈道,“玉昆你的这个发明一下就解决了船只翻越堰坝的难题,看着简单,可若是不点破,任谁都想不到。”
韩冈摇摇头:“我那只是图上文章,真正实现的还是要靠存中你的手段。”
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