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Photographic Enlarger
An enlarger is a specialized transparency projector used to produce photographic prints from film or glass negatives, or from transparencies. Construction All enlargers consist of a light source, normally an incandescent light bulb shining though a condenser or translucent screen to provide even illumination, a holder for the negative or transparency, and a specialized lens for projection, though some, such as the Rapid Rectilinear or Aplanat could be used in both camera and enlarger. Enlarger lenses, like the dialyte construction, are generally symmetrical in design or nearly so, optimised for sharp focus at 2x to 10x magnification. The light passes through a film holder, which holds the exposed and developed photographic negative or transparency. Prints made with an enlarger are called ''enlargements''. Typically, enlargers are used in a darkroom, an enclosed space from which extraneous light may be excluded; some commercial enlargers have an integral dark box so that the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Darkroom Enlarger En
A darkroom is used to process photographic film, make prints and carry out other associated tasks. It is a room that can be made completely dark to allow the processing of light-sensitive photographic materials, including film and photographic paper. Various equipment is used in the darkroom, including an enlarger, baths containing chemicals, and running water. Darkrooms have been used since the inception of photography in the early 19th century. Darkrooms have many various manifestations, from the elaborate space used by Ansel Adams to a retooled ambulance wagon used by Timothy H. O'Sullivan. From the initial development of the film to the creation of prints, the darkroom process allows complete control over the medium. Due to the popularity of color photography and complexity of processing color film (''see C-41 process'') and printing color photographs and also to the rise, first of instant photography technology and later digital photography, darkrooms have been decreasi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alexander Wolcott
Alexander Wolcott (September 15, 1758 – June 26, 1828) was a United States politician, customs inspector, and nominee to the Supreme Court of the United States. Nominated by James Madison in 1811, to replace the late William Cushing, he was rejected by the United States Senate by a vote of 9–24. He was later a delegate to the 1818 convention that drafted the Constitution of Connecticut. Early and family life Wolcott was born in Windsor, Connecticut, on September 15, 1758, to Mary Richards Wolcott. His father, also Alexander Wolcott, was a medical doctor who assisted the Patriot forces during the American Revolutionary War. He had an elder half sister, Lydia Wolcott Austin (1737–1820) as well as two sisters – Esther Wolcott Treat (1749–1841) and Elizabeth Wolcott Wolcott (1763–1817) – and a brother, Guy Wolcott (1763–1823). The younger Alexander Wolcott attended Yale College, where he studied law and graduated in 1778. He went on to practice law in Massachusetts a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Limelight
Limelight (also known as Drummond light or calcium light)James R. Smith (2004). ''San Francisco's Lost Landmarks'', Quill Driver Books. is a non-electric type of stage lighting that was once used in theatres and music halls. An intense illumination is created when a flame fed by oxygen and hydrogen is directed at a cylinder of quicklime (calcium oxide), due to a combination of incandescence and candoluminescence. Although it has long since been replaced by electric lighting, the term has nonetheless survived, as someone in the public eye is still said to be "in the limelight". The actual lamps are called "limes", a term which has been transferred to electrical equivalents. History Discovery and invention The limelight effect was discovered in the 1820s by Goldsworthy Gurney, based on his work with the "oxy-hydrogen blowpipe", credit for which is normally given to Robert Hare. In 1825, a Scottish engineer, Thomas Drummond (1797–1840), saw a demonstration of the effect ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
King's Road
King's Road or Kings Road (or sometimes the King's Road, especially when it was the king's private road until 1830, or as a colloquialism by middle/upper class London residents) is a major street stretching through Chelsea and Fulham, both in west London, England. It is associated with 1960s style and with fashion figures such as Mary Quant and Vivienne Westwood. Sir Oswald Mosley's Blackshirt movement had a barracks on the street in the 1930s. Location King's Road runs for just under through Chelsea, in the Royal Borough of Kensington & Chelsea, from Sloane Square in the east (on the border with Belgravia and Knightsbridge) and through the Chelsea Design Quarter (Moore Park Estate) on the border of Chelsea and Fulham. Shortly after crossing Stanley Bridge the road passes a slight kink at the junction with Waterford Road, where it then becomes New King's Road, continuing to Fulham High Street and Putney Bridge; its western end is in the London Borough of Hammersmith ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carte De Visite
The ''carte de visite'' (, English: 'visiting card', abbr. 'CdV', pl. ''cartes de visite'') was a format of small photograph which was patented in Paris by photographer André Adolphe Eugène Disdéri in 1854, although first used by Louis Dodero in 1851. Each photograph was the size of a formal visiting card about 4½ x 2½ inches (11.4 x 6.3 cm) and such photograph cards, in what has been called an early form of social media, were commonly traded among friends and visitors in the 1860s. Albums for the collection and display of cards became a common fixture in Victorian parlors. The popularity of the format and its rapid uptake worldwide were due to their relative thrift, which made portrait photographs accessible to a broader demographic, and prior to the advent of Halftone, mechanical reproduction of photographs, led to the publication and collection of portraits of prominent persons. It was the success of the ''carte de visite'' that led to photography's institutionalisation. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Désiré Van Monckhoven
Désiré Charles Emanuel van Monckhoven (1834–1882) was a Belgian chemist, physicist, and photographic researcher. He was also an inventor and author.Day, Lance ''et al.'' (1996) ''Biographical Dictionary of the History of Technology,'' p. 495./ref> Background Monckhoven studied chemistry and lived at Ghent, in the Flemish Region of Belgium. At 18 he published his ''Traite general de pbotographie'', In 1862 he published ''Traite populaire de photographie sur collodion''. He introduced the dialytic enlarger and in 1864 made improvements to David Acheson Woodward's solar camera used for making photographic enlargements. Monckhoven also studied photographic optics, publishing ''Photographische Optik'', in 1866. In 1867 he moved to Vienna and set up a studio with portrait photographer Rabending before returning to Ghent in 1870. Here he set up a laboratory where he carried out experiments in the ripening of gelatine silver bromide. ''Instruction sur le procede au gelatino-bromure ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heliostat
A heliostat () is a device that reflects sunlight toward a target, turning to compensate for the Sun's apparent motion. The reflector is usually a plane mirror. 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 collection. Currently, most heliostats are used for daylighting or for the production of concentrated solar power, us ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Projector
A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens, but some newer types of projectors can project the image directly, by using lasers. A virtual retinal display, or retinal projector, is a projector that projects an image directly on the retina instead of using an external projection screen. The most common type of projector used today is called a video projector. Video projectors are digital replacements for earlier types of projectors such as slide projectors and overhead projectors. These earlier types of projectors were mostly replaced with digital video projectors throughout the 1990s and early 2000s, but old analog projectors are still used at some places. The newest types of projectors are handheld projectors that use lasers or LEDs to project images. Movie theaters used a type of projector called a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solar Camera
The solar camera, or solar enlarger, is an ancestor of the darkroom enlarger, and was used in the mid-to-late 19th century to make photographic enlargements from negatives. Other uses The name ''Solar'' was registered as the brand of an unrelated electrically illuminated darkroom enlarger marketed post-WW2 in the United States by Burke & James Inc., Chicago. Description Early photographic materials were less light sensitive, and prints were made by simple superposition ("Contact prints"). The solar camera enlarger permitted photographers to make enlargements from glass negatives. However, exposures required for making such copies from negatives increase inversely with enlargement area. Photographers therefore employed the most powerful light source then available: the Sun. Solar cameras were at first freestanding, a design based on picture-taking cameras but with the relative position of negative and lens reversed so that sunlight shone through the glass plate to be projec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Collodion Process
The collodion process is an early photography, photographic process for the production of grayscale images. The collodion process – mostly synonymized with the term "''wet-plate process''", requires the photographic material to be coated, sensitized, exposed, and developed within the span of about fifteen minutes, necessitating a portable darkroom for use in the field. Collodion is normally used in its wet form, but it can also be used in its dry form, at the cost of greatly increased exposure time. The increased exposure time made the dry form unsuitable for the usual portraiture work of most professional photographers of the 19th century. The use of the dry form was mostly confined to landscape photography and other special applications where exposure times sometimes longer than a half hour were tolerable. History Gustave Le Gray first theorized about the collodion process, publishing a method in 1850 that was "theoretical at best", but Frederick Scott Archer was credited wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paper Negative
The paper negative process consists of using a negative printed on paper (either photographically or digitally) to create the final print of a photograph, as opposed to using a modern negative on a film base of cellulose acetate. The plastic acetate negative (which is what modern films produce) enables the printing of a very sharp image intended to be as close a representation of the actual subject as is possible. By using a negative based on paper instead, there is the possibility of creating a more ethereal image, simply by using a type of paper with a very visible grain, or by drawing on the paper or distressing it in some way. One of the original forms of photography was based on the paper negative process. William Henry Fox Talbot's paper negative process, which was used to create his work " The Pencil of Nature", used a negative created on paper treated with silver salts, which was exposed in a camera obscura to create the negative and then contact printed on a similar pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
