更新1:
Sorry , is : A knob for reticle illumination
English (4) A knob for ...
回答 (2)
2010-08-11 4:20 am
✔ 最佳答案
林頌賢：I believe ' a knob for reticle illumination' simply means a turnable knob for
adjusting the reticle(= reticule=graticule), a network of illuminating fine lines,
wires, etc., placed in the focal plane of an optical instrument to assist
measurement of the size or position of objects under observation.
參考: relevant sources
收錄日期: 2021-05-04 10:31:26
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100810000051KK01565