An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Ramsden disk
  گرده‌ی ِ رمزدن، دیسک ِ ~  
gerde-ye Ramsden, disk-e ~ (#)
Fr.: disque de Ramsden  

The small circular patch of light visible in the back focal plane of an eyepiece.

See also: Named after Jesse Ramsden (1735-1800), English maker of astronomical instruments; → disk.