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. [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.

Look at other dictionaries:

  • Positive eyepiece — Positive Pos i*tive, a. [OE. positif, F. positif, L. positivus. See {Position}.] 1. Having a real position, existence, or energy; existing in fact; real; actual; opposed to negative. Positive good. Bacon. [1913 Webster] 2. Derived from an object… …   The Collaborative International Dictionary of English

  • positive eyepiece — teigiamasis okuliaras statusas T sritis fizika atitikmenys: angl. positive eyepiece vok. positives Okular, n rus. положительный окуляр, m pranc. oculaire positif, m …   Fizikos terminų žodynas

  • positive eyepiece — a single lens combination, consisting of two planoconvex lenses or of an achromatic doublet or triplet, the combination being above the plane in which the real image from the objective is formed …   Medical dictionary

  • Positive — Pos i*tive, a. [OE. positif, F. positif, L. positivus. See {Position}.] 1. Having a real position, existence, or energy; existing in fact; real; actual; opposed to negative. Positive good. Bacon. [1913 Webster] 2. Derived from an object by… …   The Collaborative International Dictionary of English

  • Positive crystals — Positive Pos i*tive, a. [OE. positif, F. positif, L. positivus. See {Position}.] 1. Having a real position, existence, or energy; existing in fact; real; actual; opposed to negative. Positive good. Bacon. [1913 Webster] 2. Derived from an object… …   The Collaborative International Dictionary of English

  • Positive degree — Positive Pos i*tive, a. [OE. positif, F. positif, L. positivus. See {Position}.] 1. Having a real position, existence, or energy; existing in fact; real; actual; opposed to negative. Positive good. Bacon. [1913 Webster] 2. Derived from an object… …   The Collaborative International Dictionary of English

  • Positive electricity — Positive Pos i*tive, a. [OE. positif, F. positif, L. positivus. See {Position}.] 1. Having a real position, existence, or energy; existing in fact; real; actual; opposed to negative. Positive good. Bacon. [1913 Webster] 2. Derived from an object… …   The Collaborative International Dictionary of English

  • Positive law — Positive Pos i*tive, a. [OE. positif, F. positif, L. positivus. See {Position}.] 1. Having a real position, existence, or energy; existing in fact; real; actual; opposed to negative. Positive good. Bacon. [1913 Webster] 2. Derived from an object… …   The Collaborative International Dictionary of English

  • Positive motion — Positive Pos i*tive, a. [OE. positif, F. positif, L. positivus. See {Position}.] 1. Having a real position, existence, or energy; existing in fact; real; actual; opposed to negative. Positive good. Bacon. [1913 Webster] 2. Derived from an object… …   The Collaborative International Dictionary of English

  • Positive philosophy — Positive Pos i*tive, a. [OE. positif, F. positif, L. positivus. See {Position}.] 1. Having a real position, existence, or energy; existing in fact; real; actual; opposed to negative. Positive good. Bacon. [1913 Webster] 2. Derived from an object… …   The Collaborative International Dictionary of English

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