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本帖最后由 cjacker 于 2015-2-4 19:51 编辑
好的。
查到两个资料:
一:来自NAWCC
The term "Guillaume Balance Wheel" is only to be associated with a laminated (brass on the outside and Anibal on the inside), cut, compensating balance wheel controlled by a balance spring made of plain STEEL and known to be affected by temperature changes and MAGNETISM.
二:来自WIKI
This alloy, named anibal, is a slight variation of invar. It almost completely negated the temperature effect of the steel hairspring, but still required a bimetal compensated balance wheel, known as a Guillaume balance wheel
从这两处资料来看:
纪摆首先必须是双金属补偿的截断式摆轮。
第一种说法认为必须是纯钢游丝,双金属截短才叫纪摆。
第二种说法认为双金属截短摆轮就是纪摆
也可以确定:
elinvar这种新游丝材料跟“纪摆”这个术语没有关系。
我前面帖子里的错误是认为“纪摆”必须是“elinvar”。但从这些定义来看,elinvar并不是纪摆的必要条件。
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