艺术家: Lourenço António De Araújo
日期: 1814
尺寸: 57 x 21 cm
博物馆: Fundação Portuguesa das Comunicações (Lisbon, Portugal)
术: 铜
当人们注意到,随着19世纪邮政部门的改革,信件的分量比要行走的距离重要得多甚至更重要,实用而敏感的尺度在所有邮局中都变得不拘一格. 函文通常不是非常重的,而是成本所依赖的称重程序,需要使用相当范围内的称重,即它能够处理的最重的称重和它能够记录的最小的称重相差之间的关系,以及足够的敏感度,即它必须能够确定物体最轻的称重. 这个"信天平"在19世纪被使用,由王国邮政副总监Lourenço António de Araújo发明. 这个比例尺是被发明来权衡字母的,大多是外国字母,最初建立这个比例尺是为了方便这个烦琐而耗时的任务,因为它需要很多时间和许多工人,这会造成几个错误. 函税是根据重量和距离计算的。 随着这个比额表的制定,可以更快地权衡,并给他们正确的税收. 因此,关于这个比例表的伟大发明不是衡量权重,而是正确表示每类字母的税.
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