John Dollond

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John Dollond

John Dollond , 1706-61, English optician and inventor. A silk weaver, he taught himself languages, mathematics, and science, becoming a noted scholar as well as a scientist. He invented the achromatic lens, which led to the construction of telescopes free of color fringes, and the heliometer, used in astronomical measurement.

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Dollond, John

A Dictionary of Astronomy | 1997 | Â© A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

Dollond, John (1706–61)Englishoptician. In 1753 he invented the heliometer, and four years later discovered that an achromatic lens could be made by using two different types of glass, crown glass and flint glass. Although the principle had been discovered earlier, it was not widely known and Dollond received the credit for his independent invention. In 1765 his eldest son, Peter Dollond (1730–1820), developed the achromatic triplet lens by placing convex lenses of crown glass either side of a biconcave lens of flint glass.

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Free newspaper and magazine articles

	The heritage of Dollond & Aitchison.(TIMELINE)(Chronology)(Brief article) Magazine article from: Optometry Today; 2/13/2009
	New multiple giant will go looking for 200 new practice locations.(Boots Opticians and Dollond & Aitchison merger are looking for new sites)(Cover story)(Brief article) Magazine article from: Optometry Today; 2/13/2009
	Is this news a sign of the times?(SPECTATOR: Keeping an eye on current affairs) Magazine article from: Optometry Today; 2/27/2009

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	The heritage of Dollond & Aitchison.(TIMELINE)(Chronology)(Brief article) Magazine article from: Optometry Today; 2/13/2009; 633 words ; 1750: Peter Dollond opened a small optical business in Vine...Garden. He was joined by his father John Dollond in 1752 and early customers included...business on Fleet Street in London. 1927: Dollond & Company merged with Aitchison & Company...
	Identex appoints Account Executive for Daimler Chrysler and Dollond & Aitchison accounts. M2 Presswire; 3/12/2003; 700+ words ; ...Account Executive for Daimler Chrysler and Dollond & Aitchison accounts(C)1994...major accounts - DaimlerChrysler UK and Dollond & Aitchison. She will be responsible...British Airways, Cornhill Insurance, John Lewis Partnership and Royal & Sun...
	New multiple giant will go looking for 200 new practice locations.(Boots Opticians and Dollond & Aitchison merger are looking for new sites)(Cover story)(Brief article) Magazine article from: Optometry Today; 2/13/2009; 700+ words ; ...swallow up one of Britain's long established retail names in Dollond & Aitchison, chairman designate of the new business, Pradip...has broken out between the major groups, with Specsavers' MD John Perkins telling the newspaper he would be "highly surprised...
	After 260 years, oldest retail chain is to vanish in merger with Boots Opticians; Proud: The firm has survived countless recessions but not this one. Newspaper article from: The Daily Mail (London, England); 1/30/2009; 700+ words ; ...to 1750. It was founded by Peter Dollond, who ditched the silk trade to...July. END OF AN ERA 1750: Peter Dollond opens optical business near Spitalfields, London 1768: Brother John Dollond becomes optician to George III 1889...
	COLLECTING: Take the long view and set your sights on a telescope There's more than meets the eye to some antique models Newspaper article from: The Independent on Sunday; 7/11/2004; ; 700+ words ; ...but mostly it's to look at." Dollond telescopes are particularly sought after. Their creator, John Dollond, patented an achromatic lens for...also beware of period fakes. When John Dollond introduced the achromatic objective...
	Finishing touches as the big reveal day approaches; ++ MAKEOVER WINNER ++ 10 YEARS YOUNGER.(News) Newspaper article from: Coventry Evening Telegraph (England); 11/21/2007; 700+ words ; ...the gym and had a workout with John. I have also managed to do a...some contact lenses from Phil at Dollond & Aitchison and have tried...phillips3@ntlworld.com Dollond & Aitchison DOLLOND & AITCHISON, 8 Smithford...
	COLONIAL WILLIAMSBURG FIXING ONE OF JEFFERSON'S TELESCOPES.(LOCAL) Newspaper article from: The Virginian Pilot; 8/3/1998; 698 words ; ...late 1700s, the London firm of John and Peter Dollond made what became the most sought...clarity. Jefferson owned two Dollond telescopes, and both still exist...1786 while he was visiting the Dollond shop in London, and the other...
	British businesses back Brown's call for more Apprenticeships. M2 Presswire; 2/25/2008; 700+ words ; ...welcomed by Skills Secretary John Denham. Vodafone have committed...end of this year. Veolia and Dollond & Aitchison are among...apprentices in the coming year. John Denham said: "We must work...this goal. " Andy Ferguson, Dollond & Aitchison CEO, said...
	POST PEOPLE: Katie Bard cocktails night.(Features) Newspaper article from: The Birmingham Post (England); 1/20/2009; 453 words ; ...birminghampost.net CAPTION(S): John mortimer (Katie Bard) and Becky simkiss...all deloitte); Gemma dipple, (dollond &Aitchison), Gareth evans (Katie Bard) and nikki thomas (dollond & Aitchison); KamVara (Katie...
	POST PEOPLE: The economy.(Features) Newspaper article from: The Birmingham Post (England); 1/16/2009; 442 words ; ...net CAPTION(S): Gemma Dipple (Dollond &Aitchison), Gareth Evans (Katie Bard) and Nikki Thomas (Dollond & Aitchison).; Kam Vara (Katie...and Verity Stokes (Katie Bard); John Mortimer (Katie Bard) and Becky Simkiss...