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Jules Duboscq
Louis Jules Duboscq (March 5, 1817 – September 24, 1886) was a French instrument maker, inventor, and pioneering photographer. He was known in his time, and is remembered today, for the high quality of his optical instruments. Life and work Duboscq was born at Seine-et-Oise in 1817. He was apprenticed in 1834 to Jean-Baptiste-François Soleil (1798–1878), a prominent instrument maker, and he married one of Soleil's daughters, Rosalie Jeanne Josephine, in 1839. Among the instruments Duboscq built were a stereoscope (marketing David Brewster's lenticular stereoscope), a colorimeter, a polarimeter, a heliostat A heliostat (from ''helios'', the Greek word for ''sun'', and ''stat'', as in stationary) is a device that includes a mirror, usually a plane mirror, which turns so as to keep reflecting sunlight toward a predetermined target, compensating f ... and a saccharimeter. See also * Colorimetry (chemical method) References Further reading * * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Duboscq Jules
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Duboscq is a French surname. People with the name include: * Genevieve Duboscq (1933–2018), author * Hugues Duboscq (born 1981), Olympic breaststroke swimmer * Jules Duboscq (18171886), instrument maker, inventor, and photographer * Lucien Duboscq (1893–1935, stage actor * Octave Duboscq (1868–1943), zoologist, mycologist and parasitologist See also * Dubosc Dubosc may refer to: * André Dubosc (1866–1935), French stage and film actor * Catherine Dubosc (born 1959), French operatic soprano * Claude Dubosc (1682–1745?), French engraver * Franck Dubosc (born 1963), French actor, comedian and stand- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seine-et-Oise
Seine-et-Oise () was the former department of France encompassing the western, northern and southern parts of the metropolitan area of Paris. ''La Dépêche'' (in French), 2014-07-10. Its prefecture was and its administrative number was 78. Seine-et-Oise was disbanded in 1968 as part of the reorganisation of the departments of the Paris metropolitan area. The newly-created |
Jean-Baptiste-François Soleil
Jean-Baptiste François Soleil (1798–1878) was a French optician and engineer. Biography In 1819, Soleil founded an eponymous company at 23 Passage Vivienne in Paris, specialised in making optics instruments for such notable researchers as Fresnel, Arago, Foucault and Babinet. In 1825 he moved business to 21, rue de l'Odéon . In 1843, he made a heliostat for Jean Thiébault Silbermann.Henri Chamoux,Héliostat de Silbermann, vidéo, dans ''Inventaire des instruments scientifiques anciens dans les établissements publics'', Ressources numériques en histoire de l'éducation, consulté le 13 juin 2014 In 1849, the business was split between to divisions under his son Henri Soleil, and his son-in-law Jules Duboscq Louis Jules Duboscq (March 5, 1817 – September 24, 1886) was a French instrument maker, inventor, and pioneering photographer. He was known in his time, and is remembered today, for the high quality of his optical instruments. Life and wo .... The Solei ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stereoscope
A stereoscope is a device for viewing a stereoscopic pair of separate images, depicting left-eye and right-eye views of the same scene, as a single three-dimensional image. A typical stereoscope provides each eye with a lens that makes the image seen through it appear larger and more distant and usually also shifts its apparent horizontal position, so that for a person with normal binocular depth perception the edges of the two images seemingly fuse into one "stereo window". In current practice, the images are prepared so that the scene appears to be beyond this virtual window, through which objects are sometimes allowed to protrude, but this was not always the custom. A divider or other view-limiting feature is usually provided to prevent each eye from being distracted by also seeing the image intended for the other eye. Most people can, with practice and some effort, view stereoscopic image pairs in 3D without the aid of a stereoscope, but the physiological depth cues result ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
David Brewster
Sir David Brewster KH PRSE FRS FSA Scot FSSA MICE (11 December 178110 February 1868) was a British scientist, inventor, author, and academic administrator. In science he is principally remembered for his experimental work in physical optics, mostly concerned with the study of the polarization of light and including the discovery of Brewster's angle. He studied the birefringence of crystals under compression and discovered photoelasticity, thereby creating the field of optical mineralogy.A. D. Morrison-Low (2004) "Brewster, Sir David (1781–1868)" in ''Oxford Dictionary of National Biography'' For this work, William Whewell dubbed him the "father of modern experimental optics" and "the Johannes Kepler of optics." A pioneer in photography, Brewster invented an improved stereoscope, which he called "lenticular stereoscope" and which became the first portable 3D-viewing device. He also invented the stereoscopic camera, two types of polarimeters, the polyzonal lens, the li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colorimeter (chemistry)
A colorimeter is a device used in colorimetry that measures the absorbance of particular wavelengths of light by a specific solution. It is commonly used to determine the concentration of a known solute in a given solution by the application of the Beer–Lambert law, which states that the concentration of a solute is proportional to the absorbance. Construction The essential parts of a colorimeter are: * a light source (often an ordinary low-voltage filament lamp); * an adjustable aperture; * a set of colored filters; * a cuvette to hold the working solution; * a detector (usually a photoresistor) to measure the transmitted light; * a meter to display the output from the detector. In addition, there may be: * a voltage regulator, to protect the instrument from fluctuations in mains voltage; * a second light path, cuvette and detector. This enables comparison between the working solution and a "blank", consisting of pure solvent, to improve accuracy. There are many commerc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polarimeter
A polarimeter is a scientific instrument used to measure the angle of rotation caused by passing polarized light through an optically active substance.Polarimeter kenyon.edu Some chemical substances are optically active, and polarized (uni-directional) light will rotate either to the left (counter-clockwise) or right (clockwise) when passed through these substances. The amount by which the light is rotated is known as the angle of rotation. The direction (clockwise or counterclockwise) and magnitude of the rotation reveals information about the sample's chiral properties such as the relative concentration of ena ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heliostat
A heliostat (from ''helios'', the Greek word for ''sun'', and ''stat'', as in stationary) is a device that includes a mirror, usually a plane mirror, which turns so as to keep reflecting sunlight toward a predetermined target, compensating for the sun's apparent motions in the sky. The target may be a physical object, distant from the heliostat, or a direction in space. To do this, the reflective surface of the mirror is kept perpendicular to the bisector of the angle between the directions of the sun and the target as seen from the mirror. In almost every case, the target is stationary relative to the heliostat, so the light is reflected in a fixed direction. According to contemporary sources the heliostata, as it was called at first, was invented by Willem 's Gravesande (1688–1742). Other contenders are Giovanni Alfonso Borelli (1608–1679) and Daniel Gabriel Fahrenheit (1686–1736). A Heliostat designed by George Johnstone Storey is in the Science Museum Group coll ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saccharimeter
A saccharimeter is an instrument for measuring the concentration of sugar solutions. This is commonly achieved using a measurement of refractive index (refractometer) or the angle of rotation of polarization of optically active sugars (polarimeter). Saccharimeters are used in food processing industries, brewing, and the distilled alcoholic drinks industry. {{Gallery , align=center , File:Saccharimeter Zucker-Museum.jpg, A saccharimeter at the Sugar Museum (Berlin) , File:Polarimeter Saccharimeter-UNIL 603.867-IMG 2052-black.jpg, Saccharimeter at the EPFL Physics Museum , File:Soleil saccharimeter-IMG 6954-gradient.jpg, Soleil SOLEIL ("Sun" in French) is a synchrotron facility near Paris, France. It performed its first acceleration of electrons on May 14, 2006. The name ''SOLEIL'' is a backronym for ''Source optimisée de lumière d’énergie intermédiaire du LURE' ... saccharimeter on display at the Palais de la Découverte External links Historical Bates Type Sacch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
YouTube
YouTube is a global online video sharing and social media platform headquartered in San Bruno, California. It was launched on February 14, 2005, by Steve Chen, Chad Hurley, and Jawed Karim. It is owned by Google, and is the second most visited website, after Google Search. YouTube has more than 2.5 billion monthly users who collectively watch more than one billion hours of videos each day. , videos were being uploaded at a rate of more than 500 hours of content per minute. In October 2006, YouTube was bought by Google for $1.65 billion. Google's ownership of YouTube expanded the site's business model, expanding from generating revenue from advertisements alone, to offering paid content such as movies and exclusive content produced by YouTube. It also offers YouTube Premium, a paid subscription option for watching content without ads. YouTube also approved creators to participate in Google's AdSense program, which seeks to generate more revenue for both parties. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colorimetry (chemical Method)
In physical and analytical chemistry, colorimetry or colourimetry is a technique used to determine the concentration of colored compounds in solution. A colorimeter is a device used to test the concentration of a solution by measuring its absorbance of a specific wavelength of light (not to be confused with the tristimulus colorimeter used to measure colors in general). To use the colorimeter, different solutions must be made, including a control or reference of known concentration. With a visual colorimeter, for example the Duboscq colorimeter illustrated, the length of the light path through the solutions can be varied while filtered light transmitted through them is compared for a visual match. The concentration times path length is taken to be equal when the colors match, so the concentration of the unknown can be determined by simple proportions. Nessler tubes work on the same principle. There are also electronic automated colorimeters; before these machines a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
19th-century French Inventors
The 19th (nineteenth) century began on 1 January 1801 ( MDCCCI), and ended on 31 December 1900 ( MCM). The 19th century was the ninth century of the 2nd millennium. The 19th century was characterized by vast social upheaval. Slavery was abolished in much of Europe and the Americas. The First Industrial Revolution, though it began in the late 18th century, expanding beyond its British homeland for the first time during this century, particularly remaking the economies and societies of the Low Countries, the Rhineland, Northern Italy, and the Northeastern United States. A few decades later, the Second Industrial Revolution led to ever more massive urbanization and much higher levels of productivity, profit, and prosperity, a pattern that continued into the 20th century. The Islamic gunpowder empires fell into decline and European imperialism brought much of South Asia, Southeast Asia, and almost all of Africa under colonial rule. It was also marked by the collapse of the la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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