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第十九章 新事物

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“翟儿,跟我来,给你瞧瞧大哥新制的东西,”李业诩满脸喜色地叫着李业嗣到后园练武场内。

“大哥,这是什么?”李业嗣看着李业诩手掌中拿着的几个很小的圆状东西,很是惊讶。

“这叫指南针,用磁铁片制作成,你看,这针两端一边指着正南方,一边指向正北,”李业诩把一个小的圆盘放在李业嗣手中。

李业嗣很好奇地把小指南针放不同方位,结果无论他如何放,那针的两端顽强地指向固定一个方向。

“大哥,奇了,这东西是何道理,是不是和司南一样?你是如何制作出来的?”李业诩满是惊异地问道。

“对,和司南是同一个原理,因其有磁性,与地球磁场,算了,说了你也不明白,不说这个,”看着李业嗣一头雾水的样子,不和他讲什么地球磁场的问题,讲了这小子也不懂。

这小小的指南针是用磁石长久磁化一些薄铁片,再把这些薄铁片剪成细条状,中间穿个小孔,用针固定,又可让其自由转动。简易指南针的制作方法并不复杂,只要明白其中的原理,大多人都会制作。以李业诩的动手能力,制造这种简单的指南针,当是小事一桩,只是上面没有盖子。

没有玻璃,盖子难以制作,李业诩还没法把水晶弄成那么薄。

“大哥,送我一个吧,这东西挺好玩的,小妹也一定喜欢,”李业嗣很无耻地就把手中的指南针占为已有。

“这指南针你不能示于旁人,大有用处着,小妹你就不要让她玩了,一会我还有一个更好的东西给你看,”李业诩故作神秘状。

“是何东西?”李业嗣更是好奇。

李业诩前些日子买来的水晶,使人到市面上切割磨制成一定厚度的凸透镜和凹镜。

这时还没有玻璃,李业诩最想拥有的望远镜,只能用水晶来制造,尽量选择最好品质的水晶。在水晶店里定制的透明水晶也已经到货,店老板专程举派人送上门来,只是还没开始切割。

水晶分割的并不是很好,厚薄都有些不平,打磨后,镜面还稍微有些模糊,二十几副里面只有四五副有用。

李业诩把能用的水晶片,各选择一片凸透镜和凹镜,在阳光下测试大概的焦距,分别固定在两个软铁皮制的圆环桶里,圆环桶直径稍稍有些相差,两个圆桶可以相互套叠旋转,小的能套在大的里面。

手拿着两个镜片桶,慢慢地调试两镜的距离,终于,目镜这端看到了还算清晰的放大物体。

人类历史上第一副简单的望远镜制作完成,放大倍数大概在三到四倍左右。

只是这望远镜的成像质量不是太好,与李业诩后世所用的军用望远镜差距可不是一般的大,但也能将就着使用。

更复杂的组合镜片望远镜,只能等以后再制作了,最好能把玻璃先弄出来。

李业嗣从李业诩手中抢过了这副粗制的望远镜,在听了李业诩讲如何使用后,满是好奇地在到处乱看,嘴里不停地叫着:“大哥,那树上有只小鸟,毛是黑色的,哈哈,那匹马的眼睛都看得见,这东西真神奇,能把远处的景物拉近!”

“翟儿,还给我,我要拿去给祖父看看!”

“大哥,让我再看一下吗!哦,好的,给你…”

兄弟俩人拿着新制的东西来到李靖房中。

“祖父,孙儿制作的东西已经完成,您看一下,”脸有得色的李业诩把东西交给正在看书的李靖手中。

“这是指南针,这端是正北,这端是正南,还有这是望远镜,可以看到远处的物体!”

“啊!”遇事从来波澜不惊的李靖试用了望远镜和指南针后,满脸不可思议的神色,“翼儿,这是你制作的?”

“是的!只是工艺还不太好,孙儿再试制更好的!”

“来,坐下说,翟儿,你去看好门,不要让闲杂人员靠近…”

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