第4章 谁告诉我鬼工球这玩意该怎么做(第1页)
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这么小的东西,普通电子秤,哪怕专门称小重量的食物天平,肯定也称不出来了——读数估计都跳不出。
沈乐在“下单买个精密天平”
和“设法找人借一个”
之间纠结了三秒钟,最后还是打开了淘宝。抬眼一扫,惹不起惹不起:
国产的万分之一克电子分析天平,630一架。进口的,最便宜也要三四千一架。当然,天天特卖商店,号称精度达到0。01克的,只要一百五一架,那玩意你敢用么?
他现在每个月的固定收入,天香楼每天100,和小木偶一人一半,落袋1500。各个学校巡演,一个月22個工作日拉满,每天一百,一人一半,落袋1100。两千六百块钱,自己吃用开销,完全够了,大手大脚买仪器,那就……
沈乐思考了一下,摸起手机,刷刷翻通讯录。翻了一遍以后,还是打给了警察石光兵同志:
“喂,在吗?能不能帮我个忙?”
必须承认,地头蛇就是地头蛇。
石光兵同学打了几通电话,仗着在当地人头熟,辗转托人,居然真的帮沈乐借到了精密天平——的使用权。很快,就给沈乐来电,让他带着需要检测的东西,去某某检测中心:
“什么?要我上门?不能借过来吗?”
“你想多了!”
电话那一头,警察同志笑骂:
“万分之一天平那是什么精度,能随便搬动?别说不能搬了,放天平的桌子都是有防震效果的,称量室内的温度,也要保持恒温,不然都会影响精度!快点!那个检测员是我女朋友的同学,不然才不帮你忙!”
“好好好……”
沈乐满口答应。他把鬼工球仔细擦干净,再拿起喷枪,往里面奋力吹了一阵,将三层鬼工球内部的灰尘吹干净,带去警察说的那个检测中心。到了那边,还不准进检测室,只能隔着玻璃,踮着脚看:
那位检验员穿一身整洁的白大褂,工作帽、口罩戴得严严实实。她从自己手里接过装鬼工球的袋子,转身回到称量桌前,把天平归零,拿出了一个……
镊子?
好吧,不愧是日常用精密天平的检测中心,你们日常检测的,都是什么又轻又小的东西啊……
();() 检验员用镊子夹着鬼工球,从天平玻璃罩的开口之间送进去,放在中央的秤盘上。电子天平正前方的显示屏闪了闪,立刻跳出来一个读数:
0。6867……
沈乐掩面。很好,非常好,还真是精确到小数点后四位,非常厉害了!
他千恩万谢,顺带求爷爷告奶奶,拜托对方帮忙测了一下体积。用浸水法,测前后两次试管的溶液重量,得到的答案是:
大约0。85立方厘米。
……也就是说,这枚鬼工球用的木材,密度在0。78gcm?。沈乐对照着常见木材密度表查了半天,不得要领:
橡木,胡桃木,枫木,甚至枣木,都在这个密度区间。至于木材硬度,依靠手工测量,是真的测不出个所以然来……
“所以我到底要用哪种木头来做?”
沈乐咬牙切齿,纠结为难。其实,随便找一种合适的木头也可以,甚至他现在上网下单,订购一个合适的鬼工球也可以——
价钱甚至并不贵,15mm直径的猛犸牙鬼工球,淘宝上只要145块,鹿角鬼工球甚至只要50块。
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