Ramsden eyepiece


Ramsden eyepiece
an eyepiece consisting of two plano-convex crown-glass lenses of equal 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.
[1840-50; named after Jesse Ramsden (1735-1800), English maker of astronomical instruments]

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Universalium. 2010.

Look at other dictionaries:

  • Ramsden eyepiece — Rams·den eyepiece ramz dən n a nearly achromatic optical system that contains two plano convex lenses with the convex surfaces facing each other and is used esp. in instruments fitted with micrometer wires or a scale Ramsden Jesse (1735 1800)… …   Medical dictionary

  • Ramsden eyepiece — Ramsdeno okuliaras statusas T sritis fizika atitikmenys: angl. Ramsden eyepiece vok. Ramsdensches Okular, n rus. окуляр Рамсдена, m pranc. oculaire de Ramsden, m …   Fizikos terminų žodynas

  • ramsden eyepiece — ˈramzdən noun Usage: usually capitalized R Etymology: after Jesse Ramsden died 1800 English instrument maker : a nearly achromatic optical system of two lenses used as a magnifying glass or as an eyepiece in transits or telescopes fitted with… …   Useful english dictionary

  • Eyepiece — For the device for looking through a camera, see viewfinder. A collection of different types of eyepieces. An eyepiece, or ocular lens, is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes. It is… …   Wikipedia

  • Ramsden theodolite — The Ramsden theodolite is a large theodolite that was specially constructed for use in the first Ordnance Survey of Southern Britain. It was also known as the Great or 36 inch theodolite.The theodolite was commissioned from Jesse Ramsden, a… …   Wikipedia

  • Ramsden's eyepiece — eyepiece eye piece eye piece eye piece , n. (Opt.) The lens, or combination of lenses, at the eye end of a microscope, telescope or other optical instrument, through which the image formed by the mirror or object glass is viewed. Syn: ocular.… …   The Collaborative International Dictionary of English

  • eyepiece — eye piece eye piece eye piece , n. (Opt.) The lens, or combination of lenses, at the eye end of a microscope, telescope or other optical instrument, through which the image formed by the mirror or object glass is viewed. Syn: ocular. [1913… …   The Collaborative International Dictionary of English

  • oculaire de Ramsden — Ramsdeno okuliaras statusas T sritis fizika atitikmenys: angl. Ramsden eyepiece vok. Ramsdensches Okular, n rus. окуляр Рамсдена, m pranc. oculaire de Ramsden, m …   Fizikos terminų žodynas

  • Kellner eyepiece — /kel neuhr/, Optics. a Ramsden eyepiece having an achromatic lens, used in binoculars. [after Carl Kellner (1826 55), German opticist and lens maker] * * * …   Universalium

  • Kellner eyepiece — /kel neuhr/, Optics. a Ramsden eyepiece having an achromatic lens, used in binoculars. [after Carl Kellner (1826 55), German opticist and lens maker] …   Useful english dictionary


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