Dollond , John
(1706–1761) British optician
Dollond was born in London, the son of Huguenot refugees. He started life as a silk weaver but later joined his eldest son, Peter, in making optical instruments, and devoted years of experiment to developing an achromatic lens. The problem confronting lens makers at the time was chromatic aberration – the fringe of colors that surrounds and disturbs images formed by a lens. This put a limit on the power of lenses (and of refracting telescopes), for the stronger the lens, the more chromatically disturbed the images became. Chromatic aberration is caused by the different wavelengths that make up white light being refracted to different extents by the glass, each being focused at a different point.
In 1758 Dollond succeeded in making lenses without this defect by using two different lenses, one of crown glass and one of flint glass (one convex and one concave), so made that the chromatic aberration of one was neutralized by the aberration of the other. In fact he was not the first to make such a lens, since Chester Hall had already done so in 1753, but Dollond managed to patent the idea because he was the first to publicize the possibility.
In 1761 he was appointed optician to George III but died of apoplexy later that year.

Scientists. . 2011.

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  • Dollond, John — ▪ British optician born June 10, 1706, London, Eng. died Nov. 30, 1761, London       British maker of optical (optics) and astronomical instruments who developed an achromatic (non colour distorting) refracting telescope and a practical… …   Universalium

  • DOLLOND, JOHN —    a mathematical instrument maker, born in Spitalfields, London, of Dutch descent; began life as a silk weaver; made good use of his leisure hours in studies bearing mainly on physics; went into partnership with his son, who was an optician;… …   The Nuttall Encyclopaedia

  • Dollond, John — (10.6.1706 30.11.1761) Englischer Optiker, von Beruf eigentlich Seidenweber, arbeitete er bei seinem Sohn Peter (1730 1820), der einen optischen Betrieb gegründet hatte. Dort entdeckte er die unterschiedlichen Brechungsindizes von Flint und… …   Das Lexikon aus „Bernie's Foto-Programm"

  • Dollond, John and George — born June 10, 1706, London, Eng. died Nov. 30, 1761, London born Jan. 25, 1774, London died May 13, 1852, London British optical scientists. John developed an achromatic (non colour distorting) refracting telescope and a practical heliometer (a… …   Universalium

  • Dollond, John y George — (10 jun. 1706, Londres, Inglaterra–30 nov. 1761, Londres) (25 ene. 1774, Londres–13 may. 1852, Londres). Científicos ópticos británicos. John desarrolló un telescopio refractor acromático (que no distorsiona el color) y un heliómetro práctico (un …   Enciclopedia Universal

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  • John Dollond — Born 21 June 1706(1706 06 21) …   Wikipedia

  • John Dollond — (* 10. Juni 1706 in Spitalfields, London; † 30. November 1761 in London) war ein britischer Optiker und Teleskopbauer von französischer Herkunft. Leben Er stammte aus einer …   Deutsch Wikipedia

  • John Dollond — John Dollond. Nacimiento 10 de junio de 1706 Londres Fallecimiento 30 de noviembre de 1761 …   Wikipedia Español

  • Dollond — Dollond, John, Optiker, geb. 10. Juni 1706 in Spitalfields, gest. 30. Nov. 1761 m London, war bis 1752 Seidenweber, beschäftigte sich aber nebenbei mit Mathematik, Optik und Astronomie. Er verband sich mit seinem ältesten Sohn, Peter (geb. 24.… …   Meyers Großes Konversations-Lexikon

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