a type of telescopic eyepiece with a single field lens and a doublet eye group
Word Origin

Karl Kellner, German optical instrument maker


Read Also:

  • Kellner-eyepiece

    [kel-ner] /ˈkɛl nər/ noun, Optics. 1. a Ramsden eyepiece having an achromatic lens, used in binoculars.

  • Kellogg

    [kel-awg, -og] /ˈkɛl ɔg, -ɒg/ noun 1. Frank Billings, 1856–1937, U.S. statesman: secretary of state 1925–29; Nobel Peace Prize 1929. 2. W(ill) K(eith) 1860–1951, U.S. manufacturer of prepared cereals and philanthropist. surname, attested from late 13c., literally “kill hog,” a name for a butcher. The U.S. cereal company began in Battle Creek, Michigan, in 1906, […]

  • Kellogg-Briand Pact

    [kel-awg-bree-ahnd, -bree-ahn, -og-] /ˈkɛl ɔg briˈɑnd, -briˈɑ̃, -ɒg-/ noun 1. a treaty renouncing war as an instrument of national policy and urging peaceful means for the settlement of international disputes, originally signed in 1928 by 15 nations, later joined by 49 others.

  • Kells

    [kelz] /kɛlz/ noun 1. . /kɛlz/ noun 1. a town in the Republic of Ireland, in Co Meath: The Book of Kells, an illuminated manuscript of the Gospels, was produced at the monastery here in the 8th century. Pop: 4421 (2002)

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