第一百一十六章 老花镜的需求
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第一批十二个望远镜，李植装备给了郑开成等高级军官，其他的则给了选锋团的斥候和炮兵。龙腾小说网ltxsba.com
四月七号，第一门批量铸造的十八磅炮已经装在了城北的炮台上，是用八匹马的炮车拉上去的。炮台位于城墙后面，比城墙高两米，是个圆柱形的墩台。
李植将一门望远镜交给了负责给火炮落点校正的炮长，让他试验用望远镜校正火炮角度。
炮长抓着望远镜看了半天，一脸的兴奋，仿佛发现了新大陆。
炮长熟悉了一下望远镜后，试射就开始了。火炮手们操作火炮，用铳规、铳尺和矩度测量仰角和火药量，朝四里外的一个石灰画的大圆圈开火。
标准长炮有效射程三里，意思是在一千五百米内对特定目标能够达到有效射击效果，弹道基本是直线。用标准长炮打四里外的目标是抛射，炮击效果和精度上都会有所下降。但如果目标够大的话，调整好角度还是能打到的。
火炮轰鸣，在火舌中猛地喷出了炮弹。炮身一挫，炮弹以肉眼看不见的速度向远处射去。
四里外，用肉眼已经看不清火炮的落点，甚至连炮弹是否落在圈里都看不清。但李植用望远镜看着，却看清楚了，炮弹落在了石灰大圈左边二十米外，撞进了一片芦草里。李植取下望远镜，果然听到炮长大声喊道：“左偏十八步！”
炮手们上去拖动炮架，将火炮重新安置在炮台中间。根据炮长的观察，炮手们用矩度重新调整了炮口的角度，再次进行了射击。
火炮再次开火，轰鸣声中，炮弹在空中画出一道弧线，向四里外的白圈飞去。最后炮弹一头砸进了那个直径三十米的石灰大圈中，砸出了一片土渣子，又往前弹跳前进。
炮长兴奋地喊道：“命中目标！”
炮手们跳了起来，击掌相庆。能够在四里外命中目标，还是让炮手们很骄傲的。
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老花镜的需求，还在慢慢发酵。买了眼镜的人在别人面前使用眼镜，渐渐带动了更多的购买者。
谢晋道站在李家眼镜店前面，有些踌躇。
谢晋道是个生员，也就是秀才。他考了好多年，是二十八岁那年考上的，那时候他父母还在，一家人养他一个读书人。但是这年头秀才不值钱，他白考了一个秀才，忙碌了一辈子。如今他送走了亡去的父母，靠在王家族学里教书混一口饭吃。一年忙到头，学生们给的束脩不过二十多两。
虽说二十多两本该够他用度了，但是谢晋道好杯中之物，嗜酒，手上每有几个钱便要去买酒来过日子，所以一年到头存不下几个钱。
也就是贪杯好酒，谢晋道到了四十八岁了依旧没有娶妻，还是独身一个人。
这几年，谢晋道感觉自己身体越来越不好了。首先是腿脚不灵便了，以前走二十里山路一点事没有，如今从王家庄走到卫城十里平路都走不动了，路上要歇两次。其次手开始发抖，不知道为什么抖得利害，不搁在什么东西上面就抖个不停。
莫非是喝酒喝多了？
不过这些都是小事，最麻烦的是他的眼镜开始老花了。
作为一个读书人，眼镜老花了真是大问题。看书看不清了，写字写不好了，最糟糕的是没法好好教书了。学生写的文章谢晋道看不清楚，远远地举着眯着眼睛看，十个字里面起码有三个字靠猜，结合上下文才能猜出学生写的是什么东西。这怎么行？这样下去谢晋道就要被王家家主辞退了。
没了这族学先生的活计，谢晋道就要饿死。他堂堂一个秀才，可不想四十多岁就饿死在天0津。
谢晋道前些天遇到王家的账房先生，看见那账房先生鼻子上戴着两片玻璃片，在那里做账。谢晋道就问他你眼镜不老花啊？那账房先生得意地指着他鼻子上的玻璃片说道：
“就这两块玻璃片，十两银子！”
谢晋道当时还没听懂，问道：“什么东西这么贵！”
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