计算重量的衡器,起源于何时,尚无考古学资料可以确定。而在周代中期的青铜器铭文中,已经出现重量单位,如“寽”、“镒”、“钧”、“铢”等,春秋末期,孔子的弟子游说吴王时,有“千钧之重加铢两而移”的话,很清楚,这句话向我们传递了古代的一个信息,至迟,在距今2500年前,人们有了能称重量的器具。先秦时期的衡器,同现在的天平相似,分为两部分,一是衡,一是权。衡是衡杆,权是砝码。古代衡杆,早期用竹、木制作,以后有铜质的。衡杆中间有孔,可以拴绳吊起,两端有盘,一端放权,另端放物。待两端的重量相等,杆呈水平状态,读出权的重量,也就是物重,因此,称物要 Weighing the weight of the instrument, when it originated, there is no archaeological data can be determined. In the mid-Zhou Dynasty bronze inscriptions, there have been weight units, such as “寽 ”, “钧 ”, “Jun ”, "baht It is clear that this sentence has passed an ancient message to us. As late as 2500 years ago, people had the ability to weigh appliance. Pre-Qin period scales, similar to the current balance, is divided into two parts, one is the balance, one is the right. Balance is a balance bar, the weight is weight. Ancient pole, early use of bamboo, wood, copper later. Balance hole in the middle, you can lift the rope, both ends of the disk, one end of the delegated power, the other put the other end. To be equal weight at both ends, the lever was horizontal, the weight of the right to read, that is, weight, therefore,