An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Ramsden eyepiece
  چشمی ِ رمزدن  
cešmi-ye Ramsden (#)
Fr.: oculaire de Ramsden  

An eyepiece consisting of two planoconvex lenses of the same focal length, placed with the convex sides facing each other and with a separation between the lenses of about two-thirds of the focal length of each.

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