第22章,分律定吕

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尺寸,然而仍然没有一管能喷出葭灰。”
    “难道这只是一则假的传言?”江朔此言甫一出口便知不对,他刚刚亲眼目睹了一个竹管喷出了葭灰。
    湘儿爷爷道:“我当时也这样怀疑过,正在彼时,一管竹笛突然喷出了葭灰……”江朔瞪大了眼睛说:“难道是冬至日晚了?”爷爷摇头道:“不然,我自制日晷定的二十四节气,冬至日是日头最短的一日,决计不会搞错,喷出葭灰那一日,白昼明显比前几天要长了。”
    他说着指了一下林中空地上的一个石制日晷,石盘上的刻线均匀地分成了二十四份,中央插着一条铜针,日晷居于空地中央,周围竹子尽都刈了无法遮挡,想必是准的,江朔略知历法,道:“那确是过了冬至了,这又是怎么回事?”
    湘儿爷爷道:“我只想了几日便明白了,那是竹笛的尺寸还有微小的偏差,导致地气发动时间不在冬至日当天了,既是晚了那定是竹子短了,如此范围就缩小了,我只取上一管未喷的与这一管喷晚的竹笛中间的尺寸再做几管便可。但这次的尺寸只有细微的差别,我做的极是细致,先以黍子灌入喷灰的笛子中,量的一千一百八十粒,而上一管未喷之笛是一千二百一十粒,我便做了三十管,每管所容仅差一粒黍子,一年时间也只堪堪做成,这一次冬至日当天真的有一管喷出了葭灰,再以黍子测之,竟然恰是一千二百粒。”
    江朔叹道:“天地造化如此,令人叹服。”
    湘儿爷爷点头,道:“我还不放心此后三年各做了一管尺寸一模一样的竹笛埋入土中,三年都是在冬至日喷出葭灰,如此前后耗时九年之后,我终于确定了十二律吕的第一个音——‘黄钟’,而竹管长度按今日之尺寸计,竟然只有六寸九分三。”
    江朔再次咋舌道:“没想到今尺与周尺竟然差这么多?”
    湘儿爷爷道:“这本也在预料之中,毕竟初定十二律已是一千年前的事情啦。”
    江朔道:“有了黄钟,后面的音应该好定许多了吧?”
    湘儿爷爷道:“我原也是这般想,按三分损益法,第二个音‘大吕’应是周尺六寸四分四,由于只间隔一个月时间,我只来得及做了九管竹笛,然而第二个月——小雪节气时,却没有一个管子喷出灰来。”
    江朔吃了一惊,道:“却是为何?”湘儿爷爷说:“当时我也不知,只知道肯定是有偏差,下个月按照三分损益法又做了六管‘太簇’,却也不成,此后我跳过第四个月的‘夹钟’,直接做了十八
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    管第五个月的‘姑洗’,然而也是不成,至此我已经知道定是偏差太大,越往后越是无以校准。”
    江朔问:“那可如何是好?”
    湘儿爷爷瞪了他一眼说:“还能怎么办?只能还是用原来的笨办法,只能为来年做准备咯,我在这一年剩下的七个月又做了六十管,却仍然不成,来年我又做了一百管,这次终于对了,原来大吕比三分损益所得长度差了七分九。”
    江朔道:“差了一寸都不到,这可太难了。”
    湘儿爷爷嘿嘿一笑道:“按此比例,做出的太簇却又不灵了,原来每个律吕之间的偏差也是不均匀的。”
    江朔啊的一声惊呼。湘儿爷爷笑道:“哪又有什么办法,我也不贪心,每年定一律,好在定了太簇之后,我便知道,实际律吕都比三分损益法所计算的长度要长一些,那便省了一半的力气了,如此又是十几年,最后一管‘应钟’喷出葭灰之际,相比三分损益法所载,已差了一寸二分三了,若非我这用这个笨办法,是无论如何猜不出来的。”
    江朔问:“爷爷,那你最终定下十二律用了多少年呢?”
    听此一问,湘儿爷爷捻须哈哈大笑起来:“前前后后,算起来有二十五秋啦。”
    江朔心想二十五年比他的年齿还要翻了一倍,不禁打从心里钦佩老人的毅力,看向湘儿下拜道:“你爷爷可太厉害了。”
    湘儿道:“你随我来。”
    三人一同出了竹林,原来在竹林里转了一大圈,此处已复临湖边了,竹林和湖水之间有一小片砂石滩,临水建了一个小竹楼,竹楼外插着一排竹管圈成的围墙,这围墙甚是低矮,又参差高低不齐,竹管紧密的插在一起,围出好大一个圈,长的不过九寸,矮的将将四寸,细看管上还都钻了吹孔。
    江朔吃惊道:“这便是那些废掉的律管,这么许多啊。”
    老人笑道:“连着竹屋也是取竹制笛所剩废料做的,蔡邕是拆檐取竹为笛,我呢是反其道而行之,制笛顺便造了个小楼……你看到这篱笆墙,还只是前二十年的笛管,后五年的笛管都叫湘儿烧爆竹玩了。”
    江朔在看那些竹管,确实都是色泽枯黄,显然有些年头了。他忽然想到一个问题,问道:“那既然已经定下来十二律吕,怎地还有管子喷灰?难道今日是最后一管?”
    湘
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