第三章颗粒流光
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第三章颗粒流光(第1/2页)
高府位于城西榆林巷的别院,原是高俅早年置办的一处产业,如今给了儿子高尧卿。院子不大,胜在僻静,邻着汴河支流,平日只有三两老仆看守。
东厢房被临时改成了工坊。
赵旭站在屋中,看着面前摊开的原料:淡黄色的硝石块、暗绿色的硫磺、还有新烧的上好柳木炭。空气中弥漫着淡淡的硝石气味。
三名匠人垂手立在门边,都是三十来岁模样,手上老茧厚重,眼神里透着谨慎和好奇。他们是从殿前司兵器作坊调来的老手,按陈伯的说法,“嘴严,手稳,不问不该问的”。
“三位师傅。”赵旭拱手,“这几日要劳烦诸位了。”
为首的匠人叫鲁大,黑红脸膛,忙还礼:“先生客气。衙内吩咐,一切听先生安排。”
赵旭不再客套,走到案前:“今日我们试制新式火药。第一步,提纯。”
他拿起一块硝石:“寻常火药威力不足,大半因硝石不纯。需先以热水化开,滤去泥沙杂质,再文火慢熬,待冷却后结晶。这结晶的硝,才算可用。”
这是最基本的化学提纯,在宋代却已是秘术。鲁大三人眼睛发亮,忙取来铜锅、陶罐,按赵旭指点操作起来。
提纯硝石费时费力。整整一个上午,三人轮换搅动铜锅,赵旭则在一旁观察火候,不时指点:“火不可急,否则结晶颗粒粗糙……对,现在可以离火了,静置便好。”
待到午时,第一批硝石结晶终于完成。白色的晶体在陶盘中闪着微光,比原料纯净得多。
“先生神了!”最年轻的匠人王二忍不住惊叹,“这般硝石,小人从未见过。”
赵旭微笑:“这才第一步。接下来是硫磺提纯,原理相近,但需更小心——硫磺易燃,诸位切记远离明火。”
正说着,院门外传来脚步声。高尧卿一身常服走了进来,身后跟着陈伯。
“如何?”他径直走到案前,拈起几粒硝石结晶细看。
“刚完成第一批提纯。”赵旭答道,“下午试制颗粒火药。”
高尧卿点点头,示意鲁大等人继续,自己则引赵旭走到院中槐树下。秋日的阳光透过枝叶洒下斑驳光影。
“宫里传来消息。”他压低声音,“广圣宫斋会提前了,改在后日。说是茂德帝姬的意思——她近日心神不宁,想早做功德。”
赵旭心头微动:“那宫灯……”
“照旧。”高尧卿道,“我已打点好司饰局,明日你便以‘高府荐举巧匠赵明’的名义入宫。记住,在宫中少说多看,尤其莫要直视帝姬。”
“学生明白。”
高尧卿顿了顿,忽然道:“今早朝会,官家又提起北伐燕云之事。童贯在殿上慷慨陈词,说今冬必要出兵。”
赵旭眉头一皱:“今冬?辽国虽衰,但燕京地势险要,此时用兵……”
“谁说不是。”高尧卿冷笑,“可如今朝中,谁敢说个‘不’字?蔡太师附议,王相公关切粮草,连李邦彦那厮都写了诗颂扬——满朝衮衮诸公,倒像是去郊游一般。”
他的声音里透着深深的疲惫:“我父亲昨夜与我说,殿前司已接到密令,开始筹备出征仪仗。这大宋的江山,当真要压在一群阉人、弄臣的意气之上了。”
风吹过,槐叶簌簌落下。
赵旭沉默片刻,道:“所以火药之事,更要抓紧。若真要用兵,哪怕只能让前线将士多一分胜算,也是好的。”
高尧卿看他一眼,忽然笑了:“你倒是比我这个衙内更像个忠臣。”
“学生只是不想看见汴京……”赵旭话到嘴边又咽了回去,改口道,“不想看见百姓受苦。”
“好。”高尧卿拍拍他的肩,“去做事吧。明日入宫,我会让陈伯准备妥当。”
午后,工坊里的气氛更加凝重。
提纯后的原料按比例混合:硝七成半,硫磺一成,木炭一成半。赵旭特意让鲁大做了个小天平,虽然粗糙,但比凭感觉称量精确得多。
“接下来是关键。”赵旭将混合粉末倒入石臼,“需研磨极细,但切记不可用力过猛——摩擦生热,可能引燃。”
鲁大亲自上手,用石杵缓缓研磨。半个时辰后,粉末已细腻如面。
“现在制粒。”赵旭取来早已准备好的米浆——这是反复试验后选定的黏合剂,比水黏稠,又不像胶类那样影响燃烧。
粉末与米浆混合,渐渐成团。赵旭教三人将湿泥状的火药搓成细条,再用竹片切成均匀的小粒,摊在竹筛上阴干。
(本章未完,请点击下一页继续阅读)第三章颗粒流光(第2/2页)
“这法子……”王二忍不住道,“像是做菜丸子。”
赵旭笑了:“道理相通。颗粒火药燃烧时,颗粒间的空隙能让火焰更快传播,爆力自然更强。”
一直寡言的第三个匠人孙
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