第七百九十一章 这是黑科技【求月票】
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《汉书·律历志》谈到长度时说:“度者,分、寸、尺、丈、引也,所以度长短也。龙腾小说ltxs520.com……一为一分,十分为寸,十寸为尺,十尺为丈,十丈为引,而五度审矣。”
此处讲的五个长度单位,是分、寸、尺、丈、引,就是没有里……
当然,没有讲里的长度,不是没有里的长度,而是由于种种原因缺少记载造成的。
《汉书·食货志上》说:“理民之道,地著为本。故必建步立亩,正其经界。六尺为步,步百为亩,亩百为夫,夫三为屋,屋三为升,井方一里,是为九夫。”
从这一记载可知,井方一里,为九夫耕种的九百亩耕地,每一边的边长为一里三百步。一步六尺,则一里三百步为l800尺。
唐以后历代为工部用的营造尺,也称部尺,俗名叫鲁班尺,也叫大尺。这种尺的一个重要特点是一步为五尺。一尺的长度为秦尺的1.25尺。《续文献通考》卷中《度量衡》所载:“商尺者,即今木匠所用曲尺。盖自鲁般传至于唐,唐人谓之大尺。由唐至今用之,名曰今尺,又名营造尺。古所谓车工尺。”
由于营造尺是历代工部用的尺度,公信力强,应用广泛。随着社会发展,以营造尺计算里的长度是一种合理的选择。
等到重定度量衡时明确规定里制为:“五尺为一步,二步为一丈,十丈为一引,十八引为一里。”那都已经是清朝光绪年间的事儿了……
没有统一的、规范的、科学合理的度量衡,是制约工业发展以及自然科学的一大弊端。房俊曾向在工部弄出一个“天下标准”,不过随着他从工部离开而致使这个想法夭折。
不过这个想法看来必须提上日程了,不然单单一个“里”的长度,就把房俊弄得晕头转向,到现在也没搞明白……
苏定方咋舌道:“怎么能跑这么快?”
梁仁方显然听过苏定方的名头,对这位横扫漠北的将领甚是钦佩,因此恭敬说道:“苏都督有所不知,这船最大的优点还不在于它的快,而是他的帆!这种一整套的帆具是由大总管设计,简直巧夺天工,装上这种帆,无论顺风逆风皆可航行!”
房俊笑而不语,这跟什么帆其实没多大关系,只是一个简单的空气动力学原理而已,可就是这么一个简单的“流体速度增加,压力就会减低”的原理,当初跟梁仁方解释了半天都说不明白,最后彻底对“科普”死心的房俊干脆直接下令——你不需要知道为什么,只要照做就是了!
简单粗暴,但是很好用。
一旁的刘仁愿瞪圆了眼睛,难以置信道:“你可别扯了,迎风撒尿都能湿了裤脚,船只迎着风岂不是被吹着倒退回去?”
在他的认知里,船只在大海上航行主要靠的是帆,风吹着船帆带来动力,推着船只前进。可若是迎着风,那作用力就是反着的,怎么可能往前走呢?
梁仁方对苏定方客气,那是因为苏定方乃是击破突厥牙帐的将领,虽然勋爵不显职务不高,但功劳成就摆在那里,面对刘仁愿就不那么客气了。
这个五大三粗的家伙是谁呀?没见过……
因此梁仁方毫不客气的说道:“世间万物,皆有至理,所以要格物而致知。砂砾可以变成晶莹剔透的玻璃,矿石可以变成锋锐坚韧的兵器,水可成冰,云可化雨,为何船只就不能逆风航行?”
“这个……”刘仁愿被噎得直翻白眼,却想不出反驳之词。
房俊指着船坞中的帆船说道:“何用争执?船就在那里,咱们拉出去溜一溜,不就真相大白?不过既然刘校尉不信,梁主事却是信誓旦旦,二人各不信服,不如打个赌如何?”
这可是黑科技啊,今天定然要黑刘仁愿一回。
苏定方当即点头:“这个可以。”
看热闹的自然不怕事儿大……
裴行俭呵呵一笑:“赌钱伤感情,也俗了一些,不若就赌一只烤全羊,谁输了今晚谁就负责架火烧烤,其余人坐享其成饮酒欢聚,如何?”
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