第645章 制作热气球
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袁天罡隔了一个晚上就到了泾阳书院，夏鸿升带着他去见了乐台。龙腾小说ltxs520.com乐台根据夏鸿升提供的图纸，已经有了初步的想法，同夏鸿升一讲，夏鸿升亦觉得可行，于是袁天罡便命自己带来的道童前去采买搜集所需的东西。准备做出来第一个样品来实验。
这里面有一个不可回避的问题，那就是燃料。
目前最有效的燃料，就是夏鸿升的煤场做出来的用于炼炉或其他烧制东西时候使用的细煤粉，燃烧的最充分，热量最大。
可煤粉颇重不说，用在热气球上面，又不能说在下面一下子填满烧着之后不再管。而是要不停的加入煤粉进去，保持燃烧，提供热量，促使热空气进入热气球中，提供上升的动力。所以，热气球下需要有燃烧炉，又需要有不少的煤粉以供上升之后继续添加煤粉保持燃烧。这就极大的增加了热气球下吊篮的重量。
这是一个死循环。
热气球飞起需要燃烧煤粉提供热量，需要在吊篮中载有大量煤粉保持燃烧。载有大量煤粉，又增加了吊篮的重量，需要更大的热能，而为了获取更大的热能，又需要更多的煤粉……
不用明火而使用煤粉的好处在于，一来，煤粉是现阶段能够提供热量最多的燃料，二来，不会燎烧到热气球的球皮，三来，更加容易进行防风处理。
这个问题暂时无解。只能先做出来一个，在地面上填满了煤粉燃烧起来，能使其升空，并随着煤粉的较少而逐渐下落。先验证一下可行性。
还有球皮的材料，尼龙、涤纶之类的材料现在是必然没有的，只有布帛。不够轻便，不够结实，不够紧密不透气。
夏鸿升只能采取最早的热气球的办法，用糊纸的布制成，布的接缝用扣子扣住，再涂一层蜡或鱼胶进行封闭处理。这样会降低热气球上升的高度，不过却没有更好的替代办法了。
袁天罡还真不是盖的，只用了两天的功夫，就将所需的材料都给准备齐全了。十数辆马车载满了东西运到泾阳书院，也引起了书院学子们的围观。
“哎，你们听说了么，据说山长和乐先生要一起做一个大物件！”
“这不是废话么，谁都能看出来山长要做东西了！”
“山长要做甚子东西，你们可知道？”另外一个学子神秘兮兮的笑道：“当时我见这么多马车拉东西进来，于是主动过去帮忙，顺道听了几耳朵，好似是要做热什么球，却不知是何东西，诸位可听说过？”
一众学子议论纷纷，每天都有不少人闲来了就跑过去看。
夏鸿升将做热气球的场地给圈了起来，但是却并未遮挡，任由那些学子们围在外面观看反正他们也看不懂……
“哎，子泰兄，你乃是山长门生，可知道甚子内情？”有人向王子泰，也就是李泰问道。
李泰面无表情的摇了摇头，说了句：“不知。”
不过眼中却是一片无比的狂热，紧紧的盯着里面忙忙碌碌的乐台等人。
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