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Quadruplex Telegraph
The Quadruplex telegraph is a type of electrical telegraph which allows a total of four separate signals to be transmitted and received on a single wire at the same time (two signals in each direction). Quadruplex telegraphy thus implements a form of multiplexing. The technology was invented by Thomas Edison, who sold the rights to Jay Gould, the owner of the Atlantic and Pacific Telegraph Company, in 1874 for the sum of $30,000 (). Edison had previously been turned down by Western Union for the sale of the Quadruplex. This proved to be a grave mistake. Jay Gould used the Quadruplex to wage price wars on Western Union and to short its stock. Cornelius Vanderbilt was Western Union's largest shareholder and caught the brunt of Jay Gould's move. Vanderbilt died during the saga, which left his son William in charge. William Vanderbilt, much like his father, was no match for Jay Gould and quickly buckled. To stop the rate war Western Union bought Atlantic Pacific (and the rights t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Collection Of United States Patents Granted To Thomas A
Collection or Collections may refer to: Computing * Collection (abstract data type), the abstract concept of collections in computer science * Collection (linking), the act of linkage editing in computing * Garbage collection (computing), automatic memory management method Mathematics * Set (mathematics) * Class (set theory) * Family of sets * Indexed family * Multiset * Parametric family Albums Collection * ''Collection'' (Soccer Mommy album), 2017 * ''Collection'' (2NE1 album), 2012 * ''Collection'' (Agnes album), 2013 * ''Collection'' (Arvingarna album), 2002 * ''Collection'' (Jason Becker album), 2008 * ''Collection'' (Tracy Chapman album), 2001 * ''Collection'' (The Charlatans album) * ''Collection'' (Dave Grusin album), 1989 * ''Collection'' (The Jam album) * ''Collection'' (Wynonna Judd album) * ''Collection'' (Magnus Uggla album), 1985 * ''Collection'' (Men Without Hats album), 1996 * ''Collection'' (MFÖ album), 2003 * ''Collection'' (Mike Oldfield alb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electrical Telegraph
Electrical telegraphy is point-to-point distance communicating via sending electric signals over wire, a system primarily used from the 1840s until the late 20th century. It was the first electrical telecommunications system and the most widely used of a number of early messaging systems called '' telegraphs'', that were devised to send text messages more quickly than physically carrying them. Electrical telegraphy can be considered the first example of electrical engineering. Electrical telegraphy consisted of two or more geographically separated stations, called telegraph offices. The offices were connected by wires, usually supported overhead on utility poles. Many electrical telegraph systems were invented that operated in different ways, but the ones that became widespread fit into two broad categories. First are the needle telegraphs, in which electric current sent down the telegraph line produces electromagnetic force to move a needle-shaped pointer into position o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Multiplexer
In electronics, a multiplexer (or mux; spelled sometimes as multiplexor), also known as a data selector, is a device that selects between several Analog signal, analog or Digital signal (electronics), digital input signals and forwards the selected input to a single output line. The selection is directed by a separate set of digital inputs known as select lines. A multiplexer of 2^n inputs has n select lines, which are used to select which input line to send to the output. A multiplexer makes it possible for several input signals to share one device or resource, for example, one analog-to-digital converter or one communications transmission medium, instead of having one device per input signal. Multiplexers can also be used to implement Boolean algebra, Boolean functions of multiple variables. Conversely, a demultiplexer (or demux) is a device that takes a single input signal and selectively forwards it to one of several output lines. A multiplexer is often used with a complem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thomas Edison
Thomas Alva Edison (February11, 1847October18, 1931) was an American inventor and businessman. He developed many devices in fields such as electric power generation, mass communication, sound recording, and motion pictures. These inventions, which include the phonograph, the motion picture camera, and early versions of the electric Incandescent light bulb, light bulb, have had a widespread impact on the modern industrial society, industrialized world. He was one of the first inventors to apply the principles of organized science and teamwork to the process of invention, working with many researchers and employees. He established the first industrial research laboratory. Edison was raised in the American Midwest. Early in his career he worked as a telegraph operator, which inspired some of his earliest inventions. In 1876, he established his first laboratory facility in Menlo Park, New Jersey, where many of his early inventions were developed. He later established a botanical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jay Gould
Jason Gould (; May 27, 1836 – December 2, 1892) was an American railroad magnate and financial speculator who founded the Gould family, Gould business dynasty. He is generally identified as one of the Robber baron (industrialist), robber barons of the Gilded Age. His sharp and often unscrupulous business practices made him one of the wealthiest men of the late nineteenth century. Gould was an unpopular figure during his life and remains controversial. Early life and education Gould was born in Roxbury, New York, to Mary More (1798–1841) and John Burr Gould (1792–1866). His maternal grandfather, Alexander T. More, was a businessman, and his great-grandfather, John More, was a Scottish immigrant who founded the town of Moresville, New York. Gould, however, grew up in poverty and had to work at his family's small dairy farm. Gould studied at the Hobart Academy in Hobart, New York, paying his way by bookkeeping. As a young boy, he decided that he wanted nothing to do with far ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atlantic And Pacific Telegraph Company
The Atlantic and Pacific Telegraph Company (A&P) was an American communications company that operated in the 19th century. The Maine Legislature chartered the company in 1854. The company's stated objective was to build a telegraph system extending from the East Coast to the West Coast. In 1869 A&P leased telegraph lines from the Union Pacific Railroad (UP) and the Central Pacific Railroad, in exchange for company shares. Subsequently, the UP attempted to retake control of the lines in order to lease them to an additional, competing telegraph company, the American Union Telegraph Company. In 1880 the A&P obtained a court injunction to prevent the UP action. Through several complex transactions, which included patent negotiations with inventor Thomas Edison, financier Jay Gould acquired sufficient shares of A&P stock to obtain control of the company by 1875. (During this time, Gould was also increasing his ownership in the UP, which he ended up controlling by 1880.) Gould's takeo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cornelius Vanderbilt
Cornelius Vanderbilt (May 27, 1794 – January 4, 1877), nicknamed "the Commodore", was an American business magnate who built his wealth in railroads and shipping. After working with his father's business, Vanderbilt worked his way into leadership positions in the inland water trading, water trade and invested in the rapidly growing railroad industry, effectively transforming the geography of the United States. As one of the List of richest Americans in history, richest Americans in history and wealthiest figures overall, Vanderbilt was the patriarch of the wealthy and influential Vanderbilt family. He provided the initial gift to found Vanderbilt University in Nashville, Tennessee. For his monopoly on shipping and the railroads, facilitated by political manipulation, Vanderbilt is often described as a "robber baron (industrialist), robber baron", including in what may be one of first uses of the term, in ''The New York Times'' in 1859. Ancestry Cornelius Vanderbilt's great- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Henry Vanderbilt
William Henry Vanderbilt (May 8, 1821 – December 8, 1885) was an American businessman Known as "Billy", he was the eldest son of Commodore Cornelius Vanderbilt, an heir to his fortune and a prominent member of the Vanderbilt family. Vanderbilt became List of richest Americans in history, the richest American after he took over his father's fortune in 1877 until his own death in 1885, passing on a substantial part of the fortune to his wife and children, particularly to his sons Cornelius II and William. He inherited nearly $100 million from his father. The fortune had doubled when he died fewer than nine years later. Early life "Billy" Vanderbilt was born in New Brunswick, New Jersey, on May 8, 1821, to Commodore Cornelius Vanderbilt and Sophia Johnson. His father Cornelius frequently berated and criticized him, calling his eldest son a "blockhead" and a "blatherskite". Billy longed to show his father that he was not, in fact, a blatherskite, but never dared stand up to the C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Julius Wilhelm Gintl
Julius Wilhelm Gintl (November 12, 1804 – December 22, 1883) was an Austrian physicist. Biography Gintl was born in 1804 in Prague and attended university in his hometown. He was chair of physics at Vienna University and later at Gratz. In 1847, the Austrian government commissioned him to manage the introduction of the electrical telegraph. In 1853, Gintl developed an early form of duplex electrical telegraph, which allowed two messages to be transmitted on a single wire in opposite directions. This duplex communication was an early specific case of the general practice of multiplexing. While Gintl's technology was not commercial successful, his method was improved upon by German engineer Carl Frischen and later by J. B. Stearns, who would patent a version in 1872. Edison, who was also working on the design, would further refine his method in his implementation of a quadruplex telegraph The Quadruplex telegraph is a type of electrical telegraph which allows a total o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hysteresis
Hysteresis is the dependence of the state of a system on its history. For example, a magnet may have more than one possible magnetic moment in a given magnetic field, depending on how the field changed in the past. Plots of a single component of the moment often form a loop or hysteresis curve, where there are different values of one variable depending on the direction of change of another variable. This history dependence is the basis of memory in a hard disk drive and the remanence that retains a record of the Earth's magnetic field magnitude in the past. Hysteresis occurs in ferromagnetic and ferroelectricity, ferroelectric materials, as well as in the deformation (mechanics), deformation of rubber bands and shape-memory alloys and many other natural phenomena. In natural systems, it is often associated with irreversible process, irreversible thermodynamic change such as phase transitions and with internal friction; and dissipation is a common side effect. Hysteresis can be fou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charlieplexing
Charlieplexing (also known as tristate multiplexing, reduced pin-count LED multiplexing, complementary LED drive and crossplexing) is a technique for accessing a large number of LEDs, switches, micro-capacitors or other I/O entities, using relatively few tri-state logic wires from a microcontroller. These I/O entities can be wired as discrete components, x/y arrays, or woven in a diagonally intersecting pattern to form diagonal arrays. Etymology Although the technique was introduced in 2001 by Maxim Integrated, the name "Charlieplexing", however, first occurred in a 2003 application note. It was named after Charles "Charlie" M. Allen, an applications engineer of MAX232 fame, who had proposed this method internally. How and why to use Charlieplexing The simplest way to address a single pixel (or input button) is to run a wire out to it and another wire back to ground, but this requires a lot of wiring. A slight improvement is to have everything return on a common groun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polar Modulation
Polar modulation is analogous to quadrature modulation in the same way that polar coordinates are analogous to Cartesian coordinates. Quadrature modulation makes use of Cartesian coordinates, ''x'' and ''y''. When considering quadrature modulation, the ''x'' axis is called the ''I'' (in-phase) axis, and the ''y'' axis is called the ''Q'' (quadrature) axis. Polar modulation makes use of polar coordinates, ''r'' (amplitude) and ''Θ'' (phase). The quadrature modulator approach to digital radio transmission requires a linear RF power amplifier which creates a design conflict between improving power efficiency or maintaining amplifier linearity. Compromising linearity causes degraded signal quality, usually by adjacent channel degradation, which can be a fundamental factor in limiting network performance and capacity. Additional problems with linear RF power amplifiers, including device parametric restrictions, temperature instability, power control accuracy, wideband noise and pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
