John Dollond (June 10, 1706 - November 30, 1761) was an English optician. In the public domain by age This image is in the public domain because its copyright has expired in the United States and those countries with a copyright term of life of the author plus 100 years. ... June 10 is the 161st day of the year in the Gregorian calendar (162nd in leap years), with 204 days remaining. ... Events March 27 - Concluding that Emperor Iyasus I of Ethiopia had abdicated by retiring to a monastery, a council of high officials appoint Tekle Haymanot I Emperor of Ethiopia May 23 - Battle of Ramillies September 7 - The Battle of Turin in the War of Spanish Succession - forces of Austria and... November 30 is the 334th day (335th on leap years) of the year in the Gregorian Calendar, with 31 days remaining. ... 1761 was a common year starting on Thursday (see link for calendar). ... Royal motto (French): Dieu et mon droit (Translated: God and my right) Englands location (dark green) within the United Kingdom (light green), with the Republic of Ireland (blue) to its west Languages English Capital London Largest city London Area – Total Ranked 1st UK 130,395 km² Population –mid-2004... An optician is an individual who makes and adjusts optical aids. ...

Dollond was the son of a Huguenot refugee, a silk-weaver at Spitalfields, London, where he was born. He followed his father's trade, but found time to acquire a knowledge of Latin, Greek, mathematics, physics, anatomy and other subjects. In 1752 he abandoned silk-weaving and joined his eldest son, Peter Dollond (1730-1820), who in 1750 had started in business as a maker of optical instruments. His reputation grew rapidly, and in 1761 he was appointed optician to the king. In the 16th and 17th centuries, the name of Huguenots came to apply to members of the Protestant Reformed Church of France, or historically as the French Calvinists. ... Silk weaver Silk is a natural protein fiber that can be woven into textiles. ... Christ Church, Spitalfields Spitalfields, an area in Tower Hamlets, east London near to Liverpool Street station and Brick Lane which gets its name from a contraction of hospital fields, as there used to be a major hospital in the area. ... For other uses, see London (disambiguation). ... Latin is an ancient Indo-European language originally spoken in the region around Rome called Latium. ... Euclid, a famous Greek mathematician known as the father of geometry, is shown here in detail from The School of Athens by Raphael. ... Physics (from the Greek, φυσικός (physikos), natural, and φύσις (physis), nature) is the Science of Nature. ... Anatomical drawing of the human muscles from the Encyclopédie. ... Peter Dollond (February 24, 1731 - July 2, 1821 born Kensington, England) was an English optician, the son of John Dollond. ...

In 1758 he published an Account of some experiments concerning the different refrangibility of light (Phil. Trans., 1758), describing the experiments that led him to the achievement with which his name is specially associated, the discovery of a means of constructing achromatic lenses by the combination of crown and flint glasses. Leonhard Euler in 1747 had suggested that achromatism might be obtained by the combination of glass and water lenses. Relying on statements made by Sir Isaac Newton, Dollond disputed this possibility (Phil. Trans., 1753), but subsequently, after the Swedish physicist, Samuel Klingenstierna (1698-1765), had pointed out that Newton's law of dispersion did not harmonize with certain observed facts, he began experiments to settle the question. Leonhard Euler by Emanuel Handmann. ... Sir Isaac Newton, President of the Royal Society, (4 January 1643 – 31 March 1727) [OS: 25 December 1642 – 20 March 1727] was an English mathematician, physicist, astronomer, alchemist, chemist, inventor, and natural philosopher who is generally regarded as one of the most influential scientists and mathematicians in history. ...

Early in 1757 he succeeded in producing refraction without colour by the aid of glass and water lenses, and a few months later he made a successful attempt to get the same result by a combination of glasses of different qualities (see History of telescopes). For this achievement the Royal Society awarded him the Copley Medal in 1758, and three years later elected him one of its fellows. Dollond also published two papers on apparatus for measuring small angles (Phil. Trans., 1753, 1754). Ginny is a giant turd. ... The premises of the Royal Society in London (first four properties only). ... The Copley Medal is a scientific award for work in any field of science, the highest award granted by the Royal Society of London. ...

He was the original founder of Dollond & Aitchison the well known UK opticians. Dollond & Aitchison are the UKs longest established opticians. ...

References

• This article incorporates text from the Encyclopædia Britannica Eleventh Edition, a publication now in the public domain.

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John Dollond

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