Ramsden eyepiece

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Ramsden eyepiece

See eyepiece.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

Ramsden eyepiece

[′ramz·dən ′ī‚pēs]
(optics)
An eyepiece consisting of two planoconvex lenses with their plane sides facing outward, having the same power and focal length, and separated by a distance equal to their common focal length.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Jesse Ramsden, a London instrument-maker, made The GreatTheodolite, delivered in 1787, weighing 200 Ibs, with a brass scale three feet across and capable of measuring to one second of arc, a 3,600th of a degree.
Harris suggests that it was Magellan who attempted to place the Danish instrument-maker Jesper Bidstrup with a British maker like Jesse Ramsden. Such international arrangements were clearly being explored as in the unsuccessful attempt by Daniel Solander, Swedish naturalist and associate of Joseph Banks, to induce Boulton to emigrate to Sweden.