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Opaque Projector
The opaque projector, epidioscope, epidiascope or episcope is a device which displays opaque materials by shining a bright lamp onto the object from above. A system of mirrors, prisms and/or imaging lenses is used to focus an image of the material onto a viewing screen. Because they must project the reflected light, opaque projectors require brighter bulbs and larger lenses than overhead projectors. Care must be taken that the materials are not damaged by the heat generated by the light source. Opaque projectors are not as common as the overhead projector. Opaque projectors are typically used to project images of book pages, drawings, mineral specimens, leaves, etc. They have been produced and marketed as artists’ enlargement tools to allow images to be transferred to surfaces such as prepared canvas, or for lectures and discourses. History Swiss mathematician, physicist, astronomer, logician and engineer Leonhard Euler demonstrated an opaque projector around 1756. It could p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Episcope s.
{{Disambiguation ...
Episcope may refer to: *An opaque projector *The ministry of Oversight within various Christian Churches and in ecumenical dialogue. *An indirect vision device similar to a periscope used in armoured fighting vehicle An armoured fighting vehicle (AFV) is an armed combat vehicle protected by armour, generally combining operational mobility with offensive and defensive capabilities. AFVs can be wheeled or tracked. Examples of AFVs are tanks, armoured car ... [...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 type of stage lighting 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), which can be heated to before melting. The light is produced by 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 Although it has long since been replaced by electric lighting, the term has nonetheless survived, as someone in the public eye is still said to be "in the limelight".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), ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telop
A TELOP (TELevision OPtical Slide Projector) was the trademark name of a multifunction, four-channel "project-all" slide projector developed by the Gray Research & Development Company for television Television, sometimes shortened to TV, is a telecommunication medium for transmitting moving images and sound. The term can refer to a television set, or the medium of television transmission. Television is a mass medium for advertisin ... usage, introduced in 1949. It was best remembered in the industry as an opaque slide projector for title cards. Before Telop In the early days of television, there were two types of slides for broadcast—a ''transparent slide'' or transparency, and an ''opaque'' slide, or ''Balop'' (a genericized trademark of Bausch & Lomb's Balopticon projectors.) Transparency slides were prepared as 2-inch square cards mounted in cardboard or glass, or film, surrounded by a half-inch of masking on all four sides. Opaque, "Balop" slides were ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Projector (other)
A projector is a device that projects an image on a surface. Projector may also refer to: Computing * Projector PSA, a software and cloud-computing company * Projector, a version control system used in the Macintosh Programmer's Workshop Weaponry * Projector, a type of mortar ** Livens Projector ** PIAT (Projector, Infantry, Anti Tank), British Second World War spigot mortar * Holman Projector * Northover Projector Other uses * ''Projector'' (album), a 1999 album by Dark Tranquillity * Projector (patent), the original inventor to reduce an invention to practice * In mathematics, a projection operator *The Projector, a Singaporean cinema chain See also * Corporate promoter or projector, e.g. in the phrase "railway projectors" * Projection (other) Projection, projections or projective may refer to: Physics * Projection (physics), the action/process of light, heat, or sound reflecting from a surface to another in a different direction * The display of images by a pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Video Camera
A video camera is an optical instrument that captures videos (as opposed to a movie camera, which records images on film). Video cameras were initially developed for the television industry but have since become widely used for a variety of other purposes. Video cameras are used primarily in two modes. The first, characteristic of much early broadcasting, is live television, where the camera feeds real time images directly to a screen for immediate observation. A few cameras still serve live television production, but most live connections are for security, military/tactical, and industrial operations where surreptitious or remote viewing is required. In the second mode the images are recorded to a storage device for archiving or further processing; for many years, videotape was the primary format used for this purpose, but was gradually supplanted by optical disc, hard disk, and then flash memory. Recorded video is used in television production, and more often surveillance and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Document Camera
Document cameras, also known as visual presenters, visualizers, digital overheads, or docucams, are real-time image capture devices for displaying an object to a large audience. Like an opaque projector, a document camera is able to magnify and project the images of actual, three-dimensional objects, as well as transparencies. They are, in essence, high resolution web cams, mounted on arms so as to facilitate their placement over a page. This allows a teacher, lecturer or presenter to write on a sheet of paper or to display a two or three-dimensional object while the audience watches. Theoretically, all objects can be displayed by a document camera. Most objects are simply placed under the camera. The camera takes the picture which in turn produces a live picture using a projector or monitor. Different types of document camera/visualizer allow great flexibility in terms of placement of objects. Larger objects, for example, can simply be placed in front of the camera and the camera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Halogen Lamp
A halogen lamp (also called tungsten halogen, quartz-halogen, and quartz iodine lamp) is an incandescent lamp consisting of a tungsten filament sealed in a compact transparent envelope that is filled with a mixture of an inert gas and a small amount of a halogen, such as iodine or bromine. The combination of the halogen gas and the tungsten filament produces a halogen-cycle chemical reaction, which redeposits evaporated tungsten on the filament, increasing its life and maintaining the clarity of the envelope. This allows the filament to operate at a higher temperature than a standard incandescent lamp of similar power and operating life; this also produces light with higher luminous efficacy and color temperature. The small size of halogen lamps permits their use in compact optical systems for projectors and illumination. The small glass envelope may be enclosed in a much larger outer glass bulb, which has a lower temperature, protects the inner bulb from contamination, and mak ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Incandescent Light Bulb
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light with a wire filament heated until it glows. The filament is enclosed in a glass bulb with a vacuum or inert gas to protect the filament from oxidation. Current is supplied to the filament by terminals or wires embedded in the glass. A bulb socket provides mechanical support and electrical connections. Incandescent bulbs are manufactured in a wide range of sizes, light output, and voltage ratings, from 1.5 volts to about 300 volts. They require no external regulating equipment, have low manufacturing costs, and work equally well on either alternating current or direct current. As a result, the incandescent bulb became widely used in household and commercial lighting, for portable lighting such as table lamps, car headlamps, and flashlights, and for decorative and advertising lighting. Incandescent bulbs are much less efficient than other types of electric lighting, converting les ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
François-Napoléon-Marie Moigno
Abbé François-Napoléon-Marie Moigno (; 15 April 1804 – 14 July 1884) was a French Catholic priest and one time Jesuit, as well as a physicist and author. He considered himself a student of Cauchy. Life Moigno was born at Guémené-sur-Scorff, Morbihan, in Brittany, on 15 April 1804. He received his early education at the Jesuit college at Sainte-Anne-d'Auray and entered the novitiate of the Society of Jesus on 2 September 1822. He did his theological studies at Montrouge, devoting his leisure to mathematics and physics. On the outbreak of the Revolution of 1830, he left with his fellow Jesuits for Brieg in Switzerland. There he acquired several languages, including Hebrew and Arabic. In 1836 he was appointed professor of mathematics at the College of Sainte-Geneviève, Rue des Postes, in Paris. Here he became known not only as a scholar, but also as a preacher and writer. He wrote numerous articles for the press; he was engaged on one of his best known works, "Leçons de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lens (optics)
A lens is a transmissive optical device which focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (''elements''), usually arranged along a common axis. Lenses are made from materials such as glass or plastic, and are ground and polished or molded to a desired shape. A lens can focus light to form an image, unlike a prism, which refracts light without focusing. Devices that similarly focus or disperse waves and radiation other than visible light are also called lenses, such as microwave lenses, electron lenses, acoustic lenses, or explosive lenses. Lenses are used in various imaging devices like telescopes, binoculars and cameras. They are also used as visual aids in glasses to correct defects of vision such as myopia and hypermetropia. History The word ''lens'' comes from '' lēns'', the Latin name of the lentil (a seed of a lentil plant), ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxyhydrogen
Oxyhydrogen is a mixture of hydrogen (H2) and oxygen (O2) gases. This gaseous mixture is used for torches to process refractory materials and was the first gaseous mixture used for welding. Theoretically, a ratio of 2:1 hydrogen:oxygen is enough to achieve maximum efficiency; in practice a ratio 4:1 or 5:1 is needed to avoid an oxidizing flame. This mixture may also be referred to as ' (Scandinavian and German Knallgas: "bang-gas"), although some authors define knallgas to be a generic term for the mixture of fuel with the precise amount of oxygen required for complete combustion, thus 2:1 oxyhydrogen would be called "hydrogen-knallgas". "Brown's gas" and HHO are terms for oxyhydrogen mainly encountered in fringe science. Properties Oxyhydrogen will combust when brought to its autoignition temperature. For the stoichiometric mixture, 2:1 hydrogen:oxygen, at normal atmospheric pressure, autoignition occurs at about 570 °C (1065 °F). The minimum energy required t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henry Morton (scientist)
Henry Jackson Morton (December 11, 1836 – May 9, 1902) was a United States scientist and the first president of the Stevens Institute of Technology. Education and early career He was the son of Rev. Henry Morton (1807–1890), a clergyman who was rector of St. James's church in Philadelphia for many years and a trustee of the University of Pennsylvania. Henry J. Morton graduated from the University of Pennsylvania in 1857, and became professor of physics and chemistry at the Episcopal Academy of Philadelphia in 1860.Coleman Sellers and Albert R. Leeds, ''Biographical Notice of President Henry Morton, Ph.D. of the Stevens Institute of Technology'' New York: The Engineering Press, 1892, p.11 In 1863, he delivered a series of lectures on chemistry at the Franklin Institute. A year later, he was appointed resident secretary at Franklin Institute, where he continued his lectures. His lectures on light attracted attention throughout the United States and Europe by reason of his bri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
