Ramsden's eyepiece

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. [1913 Webster]

{Collimating eyepiece}. See under {Collimate}.

{Negative}, or {Huyghenian}, {eyepiece}, an eyepiece consisting of two plano-convex lenses with their curved surfaces turned toward the object glass, and separated from each other by about half the sum of their focal distances, the image viewed by the eye being formed between the two lenses. it was devised by Huyghens, who applied it to the telescope. Campani applied it to the microscope, whence it is sometimes called {Campani's eyepiece}.

{Positive eyepiece}, an eyepiece consisting of two plano-convex lenses placed with their curved surfaces toward each other, and separated by a distance somewhat less than the focal distance of the one nearest eye, the image of the object viewed being beyond both lenses; -- called also, from the name of the inventor, {Ramsden's eyepiece}.

{terrestrial}, or {Erecting eyepiece}, an eyepiece used in telescopes for viewing terrestrial objects, consisting of three, or usually four, lenses, so arranged as to present the image of the object viewed in an erect position. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • 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

  • 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

  • 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 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 — 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

  • Campani'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

  • Collimating 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

  • Erecting 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

  • Positive 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

  • 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

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”