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Peter Dollond
Peter Dollond (24 February 1731 – 2 July 1820) was an English maker of optical instruments, the son of John Dollond. He is known for his successful optics business, and for the invention of the apochromat. Biography Dollond was born in Kensington. Working together with his father and subsequently with his younger brother and nephew (George Dollond) he successfully designed and manufactured a number of optical instruments. He is particularly credited with the invention of the triple achromatic lens - i.e., apochromatic lens - in 1763, still in wide use today, though known as the Cooke triplet after a much later 1893 patent. Peter Dollond worked at first silk weaving with his father, but his father's passion for optics inspired him so much that in 1750 Peter quit the silk business and opened an optical instruments shop in Kennington, London. After two years, his father gave up silk, too, and joined him. Dollond telescopes, for sidereal or terrestrial use, were amongst the most ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kensington
Kensington is a district in the Royal Borough of Kensington and Chelsea in the West End of London, West of Central London. The district's commercial heart is Kensington High Street, running on an east–west axis. The north-east is taken up by Kensington Gardens, containing the Albert Memorial, the Serpentine Gallery and John Hanning Speke, Speke's monument. South Kensington and Gloucester Road, London, Gloucester Road are home to Imperial College London, the Royal College of Music, the Royal Albert Hall, Natural History Museum, London, Natural History Museum, Victoria and Albert Museum, and Science Museum, London, Science Museum. The area is also home to many embassies and consulates. Name The Manorialism, manor of ''Chenesitone'' is listed in the Domesday Book of 1086, which in the Old English language, Anglo-Saxon language means "Chenesi's List of generic forms in place names in Ireland and the United Kingdom, ton" (homestead/settlement). One early spelling is ''Kesyngton ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Philosophical Society
The American Philosophical Society (APS), founded in 1743 in Philadelphia, is a scholarly organization that promotes knowledge in the sciences and humanities through research, professional meetings, publications, library resources, and community outreach. Considered the first learned society in the United States, it has about 1,000 elected members, and by April 2020 had had only 5,710 members since its creation. Through research grants, published journals, the American Philosophical Society Museum, an extensive library, and regular meetings, the society supports a variety of disciplines in the humanities and the sciences. Philosophical Hall, now a museum, is just east of Independence Hall in Independence National Historical Park; it was designated a National Historic Landmark in 1965. History The Philosophical Society, as it was originally called, was founded in 1743 by Benjamin Franklin, James Alexander (lawyer), James Alexander, Francis Hopkinson, John Bartram, Philip Syn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Optician
An optician, or ''dispensing optician'', is a technical practitioner who designs, fits and dispenses lenses for the correction of a person's vision. Opticians determine the specifications of various ophthalmic appliances that will give the necessary correction to a person's eyesight. Some registered or licensed opticians also design and fit special appliances to correct cosmetic, traumatic or anatomical defects. These devices are called shells or artificial eyes. Other registered or licensed opticians manufacture lenses to their own specifications and design and manufacture spectacle frames and other devices. Corrective ophthalmic appliances may be contact lenses, spectacles lenses, low vision aids or ophthalmic prosthetics to those who are partially sighted. The appliances are mounted either on the eye as contact lenses or mounted in a frame or holder in front of the eye as spectacles or as a monocle. Opticians may work in any variety of settings such as joint practice, hospi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dollond & Aitchison
Dollond & Aitchison was one of the oldest chains of retail opticians in the United Kingdom, having been established in 1750. The business was absorbed into Boots Opticians in 2009 and stores were rebranded under the Boots Opticians name, completed in 2015. History On 21 April 1750, Peter Dollond opened a small optical business in Vine Street, near Hatton Garden in London. He was joined by his father, John Dollond, in 1752. The Dollonds became notable for the quality of their optical products. In 1761 John Dollond, now a partner in the business, was appointed optician to King George III and the Duke of York and Albany. In 1781, Peter Dollond made bifocal spectacles. At The Great Exhibition 1851 in London, the Dollonds were awarded a medal for the excellence of their optical instruments. In 1889, James Aitchison established his first business in Fleet Street. In 1927 ''Dollond & Co'' merged with ''Aitchison & Co'', to form ''Dollond & Aitchison'' (abbreviated ''D&A''). In 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
James Lind (naturalist)
James Lind FRS FRSE FRCPE (1736–1812) was a Scottish natural philosopher and physician. Life James Lind was born in Gorgie, Edinburgh on 17 May 1736. He studied medicine at Edinburgh University under William Cullen and Joseph Black, and graduated in 1768. In 1766, he then joined the East India Company as surgeon. In 1768 he received his doctorate (MD) from Edinburgh upon completing a dissertation on marsh fever (malaria) in Bengal. On 6 November 1770 he was admitted a Fellow of the College of Physicians, Edinburgh. Lind was also a corresponding member of the Lunar Society. Personality Lind is widely regarded as having an eccentric personality, and considered to be reckless with spending money as captured by the following dialogue: "Why, Dr. Lind, you spend a whole seas of gold", to which Lind replied, "Madam, 'tis true, my very name, behold, Begins with pounds and ends, alas, with pence" Charles Burney described Lind as extremely thin, tall, with grey hair as seen aroun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thomas Jefferson
Thomas Jefferson (April 13, 1743 – July 4, 1826) was an American statesman, diplomat, lawyer, architect, philosopher, and Founding Fathers of the United States, Founding Father who served as the third president of the United States from 1801 to 1809. He was previously the nation's second vice president of the United States, vice president under John Adams and the first United States Secretary of State, United States secretary of state under George Washington. The principal author of the United States Declaration of Independence, Declaration of Independence, Jefferson was a proponent of democracy, republicanism, and individual rights, motivating Thirteen Colonies, American colonists to break from the Kingdom of Great Britain and form a new nation. He produced formative documents and decisions at state, national, and international levels. During the American Revolution, Jefferson represented Virginia in the Continental Congress that adopted the Declaration of Independence. As ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frederick The Great
Frederick II (german: Friedrich II.; 24 January 171217 August 1786) was King in Prussia from 1740 until 1772, and King of Prussia from 1772 until his death in 1786. His most significant accomplishments include his military successes in the Silesian wars, his re-organisation of the Prussian Army, the First Partition of Poland, and his patronage of the arts and the Enlightenment. Frederick was the last Hohenzollern monarch titled King in Prussia, declaring himself King of Prussia after annexing Polish Prussia from the Polish–Lithuanian Commonwealth in 1772. Prussia greatly increased its territories and became a major military power in Europe under his rule. He became known as Frederick the Great (german: links=no, Friedrich der Große) and was nicknamed "Old Fritz" (german: links=no, "Der Alte Fritz"). In his youth, Frederick was more interested in music and philosophy than in the art of war, which led to clashes with his authoritarian father, Frederick William I of Prussia. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leopold Mozart
Johann Georg Leopold Mozart (November 14, 1719 – May 28, 1787) was a German composer, violinist and theorist. He is best known today as the father and teacher of Wolfgang Amadeus Mozart, and for his violin textbook ''Versuch einer gründlichen Violinschule'' (1756). Life and career Childhood and youth He was born in Augsburg, son of Johann Georg Mozart (1679–1736), a bookbinder, and his second wife Anna Maria Sulzer (1696–1766). From an early age he sang as a choirboy. He attended a local Jesuit school, , where he studied logic, science, and theology, graduating ''magna cum laude'' in 1735. He studied then at the St. Salvator Lyzeum. While a student in Augsburg, he appeared in student theater productions as an actor and singer, and became a skilled violinist and organist. He also developed an interest, which he retained, in microscopes and telescopes. Although his parents had planned a career for Leopold as a Catholic priest, this apparently was not Leopold's own wish. An ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flint Glass
Flint glass is optical glass that has relatively high refractive index and low Abbe number (high Dispersion (optics), dispersion). Flint glasses are arbitrarily defined as having an Abbe number of 50 to 55 or less. The currently known flint glasses have refractive indices ranging between 1.45 and 2.00. A Lens (optics)#Types of simple lenses, concave lens of flint glass is commonly combined with a Lens (optics)#Types of simple lenses, convex lens of Crown glass (optics), crown glass to produce an achromatic doublet lens because of their compensating optical properties, which reduces chromatic aberration (colour defects). With respect to glass, the term ''flint'' derives from the flint nodules found in the chalk deposits of southeast England that were used as a source of high purity silica by George Ravenscroft, c. 1662, to produce a potash lead glass that was the precursor to English lead crystal. Traditionally, flint glasses were lead glasses containing around 4–60% lead(II) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Right Of First Refusal
Right of first refusal (ROFR or RFR) is a contractual right that gives its holder the option to enter a business transaction with the owner of something, according to specified terms, before the owner is entitled to enter into that transaction with a third party. A first refusal right must have at least three parties: the owner, the third party or buyer, and the option holder. In general, the owner must make the same offer to the option holder ''before'' making the offer to the buyer. The right of first refusal is similar in concept to a call option. An ROFR can cover almost any sort of asset, including real estate, personal property, a patent license, a screenplay, or an interest in a business. It might also cover business transactions that are not strictly assets, such as the right to enter a joint venture or distribution arrangement. In entertainment, a right of first refusal on a concept or a screenplay would give the holder the right to make that movie first while in real ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
De Facto
''De facto'' ( ; , "in fact") describes practices that exist in reality, whether or not they are officially recognized by laws or other formal norms. It is commonly used to refer to what happens in practice, in contrast with ''de jure'' ("by law"), which refers to things that happen according to official law, regardless of whether the practice exists in reality. History In jurisprudence, it mainly means "practiced, but not necessarily defined by law" or "practiced or is valid, but not officially established". Basically, this expression is opposed to the concept of "de jure" (which means "as defined by law") when it comes to law, management or technology (such as standards) in the case of creation, development or application of "without" or "against" instructions, but in accordance with "with practice". When legal situations are discussed, "de jure" means "expressed by law", while "de facto" means action or what is practiced. Similar expressions: "essentially", "unofficial", "in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Royal Society
The Royal Society, formally The Royal Society of London for Improving Natural Knowledge, is a learned society and the United Kingdom's national academy of sciences. The society fulfils a number of roles: promoting science and its benefits, recognising excellence in science, supporting outstanding science, providing scientific advice for policy, education and public engagement and fostering international and global co-operation. Founded on 28 November 1660, it was granted a royal charter by King Charles II as The Royal Society and is the oldest continuously existing scientific academy in the world. The society is governed by its Council, which is chaired by the Society's President, according to a set of statutes and standing orders. The members of Council and the President are elected from and by its Fellows, the basic members of the society, who are themselves elected by existing Fellows. , there are about 1,700 fellows, allowed to use the postnominal title FRS (Fellow of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
