Ramsden eyepiece

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noun Optics.

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.

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Origin of Ramsden eyepiece

1840–50; named after Jesse Ramsden (1735–1800), English maker of astronomical instruments

Words nearby Ramsden eyepiece

ramp-up, Rampur, ram raid, ramrod, Ramsay, Ramsden eyepiece, Ramses, Ramses I, Ramses II, Ramses III, Ramsey

How to use Ramsden eyepiece in a sentence

Ramsden's 381-page report found that the flight was troubled from the start.
Navy Report on Maryland Drone Crash: ‘Disastrous Results’ Averted|Jefferson Morley|June 26, 2013|DAILY BEAST
"Failure to adhere to emergency protocols did not produce disastrous results in this particular event," Ramsden wrote.
Navy Report on Maryland Drone Crash: ‘Disastrous Results’ Averted|Jefferson Morley|June 26, 2013|DAILY BEAST
Before beginning an exposure the focus is adjusted by means of a high-power positive eyepiece.
Photographs of Nebul and Clusters|James Edward Keeler
It was Mrs Ramsden who was wretched, Elma who was happy—“so happy,” despite the atmosphere of disapproval.
Flaming June|Mrs. George de Horne Vaizey

“I think you and Mrs Ramsden have somewhat different standards, mother,” put in Geoffrey quietly.
Flaming June|Mrs. George de Horne Vaizey
Looking through the eyepiece, the young inventor stood as though transfixed.
Tom Swift and His Giant Telescope|Victor Appleton
Beware of the popular error that an object held close in front of a telescope can be seen by an observer at the eyepiece.
A Text-Book of Astronomy|George C. Comstock