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

Rampur, ram raid, ramrod, Ramsay, Ramsay Hunt's syndrome, 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