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本帖最后由 老陈 于 2011-11-22 19:49 编辑
xhandy 发表于 2011-11-22 09:39
多谢老陈兄!把假冒手法的纰漏和鉴别方法都指出来,对新入门的朋友指导很大
这只雅典非常精彩,有 ...
逃不过版主的眼睛。这不是怀表,是船上用的东西。确实是guillaume摆轮。跟新朋友说一下谓guillaume摆轮是殷钢作为摆轮的材料,它质地均匀,稳定,受温度影响变化较小,法国人Charles Edouard Guillaume因此被授予了1920年的**奖。
这篇文章对理解GUILLAUME,INVAR,ELIVAR 有所帮助。
In addition to the name Invar, another name for the same material became known as Elinvar. The Elinvar name was used by the Hamilton Watch Company. The materials used by Hamilton may have been somewhat improved upon or Hamilton may have used slightly different materials. The end result was the same. Hairsprings were no longer affected by changes in temperature. However, there is a major difference between the two metals as follows:
From 1890 he focused his attention on alloys and developed invar and elinvar. Invar's low coefficient of expansion (change in volume caused by change in temperature) and elinvar's low coefficient of elasticity (change in elasticity caused by change in temperature), combined with their low cost, resulted in their widespread use in scientific instruments
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