第206章 望远镜
最新网址：m.ltxsdz.com
。龙腾小说ltxs520.com”说到这里，丘待诏便不由诉苦。“以前琢玉，最怕的就是玉料不纯，到了关键时刻，出了斑斑杂杂的东西。没想到玻璃还不如玉料，因为中间有杂料或者气泡，不知道磨废了多少，不然哪里要废这许多功夫！”
这个没办法，现在工艺就那水平，厚一点的玻璃就容易有杂质和气泡，一时半会是解决不了这问题的。这还是徐平想尽力法，精心计算之后用玻璃铸出粗坯，大减小了玻璃的厚度，也减少了磨削的用工量，不然丘待诏还要花更多的时间。
对这件事情燕肃比徐平还上心，听了丘待诏的话，迫不及待地道：“既然如此，待诏喝口茶歇一歇，我们便就过去看如何？”
面对两位待制，丘待诏也拿不起架子来，把杯里的茶喝完，起身道：“既然两位待制官人如此焦急，我们便就去吧，看看哪里还有不合意的。”
“好，好，待诏先行！”
燕肃急忙起身，与徐平一起随着丘待诏出了客厅。
到了旁边丘待诏工作的小房间，扑面而来的就是呛人的粉尘味。虽然是用水磨，一天到晚做下来漫天的粉尘还是避免不了的。
徐平皱了皱眉头，这工作环境着实有些艰苦，心里想着，等过些日子棉纱纺出来，要想办法给这些人做些口罩，免得整天吸粉尘，对身体不利。
进了房子，丘待诏小心地从桌子上拿了一片透明的镜片起来，用旁边放着的绸布擦得锃亮，小心地递过来，口中道：“待制官人请看，可还中意？”
燕肃接过，拿在手里翻来覆去，又举在眼前看了看，透过镜片看到的景物都变形得稀奇古怪，让他觉得分外新奇。不过他是第一次看这种奇物，心里没底，看了两眼便递给徐平：“徐平待制，你看这东西可合用？”
徐平接过，看这镜片晶莹透亮，没有一点杂质和气泡，质量极佳，点了点头：“好是极好了，没一点瑕疵在里面。不过，丘待诏，聚光点你可曾经测过？”
“那是自然，副使吩咐，小的哪里敢不照做？”丘待诏说着，一边指了指身后的一处黑盒子，“两位待制官人尽可以自己看。不过现在太阳已经落山，测起来可能不准。”
“待诏测过就好了，何必再费一遍事？”徐平说着，把手里的镜片小心地放到桌子上，“除了这片，还有哪些？待诏可都把聚光点远近都标记清楚？”
透镜片的焦距非常重要，如果不测清楚，装望远镜就只能胡乱凑了。
那个黑盒子是徐平制来专门测焦距的，一边装透镜片，另一边则可以移动，下面有标尺。另两面一边用木板堵死，另一边开着让人观察。白天太阳正好的时候，把要测的透镜片装在上面，慢慢移动聚焦的一边，等到聚焦时利用标尺读出透镜的焦距。
太阳光可以认为是平行光线，利用这种方法，测出来的焦距数值就基本能用了。如果不用太阳光，就需要用光学手段制造出平行光来，太过麻烦。
丘待诏指着桌子上的几片镜片道：“总共有五六块吧，按徐副使吩咐，那种什么凸透镜少一些，凹透镜多一些，看看是要怎么用。”
徐平上前，看桌子上放了六块镜片，四块凸透镜，两块凹透镜，旁边都用笔仔细标好了焦距，镜片都一般的晶莹剔透。不远处，则是一大堆磨废了的镜片，丘待诏显然费了不少功夫。主要原因还是玻璃的质量不好，透光率的高稳定性好的玻璃配方还在摸索之中。
燕肃靠上来，看着镜片问徐平：“那个什么望远镜，是要怎么制？”
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