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Reis Telephone
The Reis telephone was an invention named after Philipp Reis of a telephone-like device he constructed. Reis's first successful work is dated to October 1861. History In 1861, Philipp Reis succeeded in creating a device that captured sound, converted it to electrical impulses which were transmitted via electrical wires to another device that transformed these pulses into recognizable sounds similar to the original acoustical source. Reis coined the term ''telephon'' to describe his device. In 1862, Reis demonstrated his telephone to Wilhelm von Legat, Inspector of the Royal Prussian Telegraph Corps who produced an account of it (Legat, 1862), a translation of which was obtained by Thomas Edison in 1875 and which was used in Edison's successful development of the carbon microphone. The Legat account included drawings that are different from that below, suggesting that it is of a later version. Edison acknowledged his debt to Reis thus: The first inventor of a telephone was Phil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DBP 1961 373 100 Jahre Telefon Von Philipp Reis
DBP may refer to: Medicine * DBP (gene), a gene coding for the D site of albumin promoter (albumin D-box) binding protein * Deathbed phenomena * Diastolic blood pressure, minimum blood pressure between two heartbeats * Vitamin D-binding protein Science and technology *Dibutyl phthalate, a plasticizer *Digital back-propagation, a technique for compensating all fiber impairments in optical transmission systems *Disinfection by-product, a chemical occurring in water as a result of disinfection Other *Dave Benson Phillips, a British children's TV presenter *Democratic Regions Party,( tr, Demokratik Bölgeler Partisi, links=no), a political party in Turkey * Deutsche Bauernpartei, former German political party *Deutsche Bundespost, former German federal post office *Development Bank of the Philippines *Dewan Bahasa dan Pustaka, a government body responsible for coordinating the use of the Malay language in Malaysia *Dewan Bahasa dan Pustaka Brunei, the official Malay-language r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Current (electricity)
An electric current is a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is measured as the net rate of flow of electric charge through a surface or into a control volume. The moving particles are called charge carriers, which may be one of several types of particles, depending on the conductor. In electric circuits the charge carriers are often electrons moving through a wire. In semiconductors they can be electrons or holes. In an electrolyte the charge carriers are ions, while in plasma, an ionized gas, they are ions and electrons. The SI unit of electric current is the ampere, or ''amp'', which is the flow of electric charge across a surface at the rate of one coulomb per second. The ampere (symbol: A) is an SI base unit. Electric current is measured using a device called an ammeter. Electric currents create magnetic fields, which are used in motors, generators, inductors, and transformers. In ordinary conduct ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telephony Equipment
Telephony ( ) is the field of technology involving the development, application, and deployment of telecommunication services for the purpose of electronic transmission of voice, fax, or data, between distant parties. The history of telephony is intimately linked to the invention and development of the telephone. Telephony is commonly referred to as the construction or operation of telephones and telephonic systems and as a system of telecommunications in which telephonic equipment is employed in the transmission of speech or other sound between points, with or without the use of wires. The term is also used frequently to refer to computer hardware, software, and computer network systems, that perform functions traditionally performed by telephone equipment. In this context the technology is specifically referred to as Internet telephony, or voice over Internet Protocol (VoIP). Overview The first telephones were connected directly in pairs. Each user had a separate telephone wired ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of German Inventors And Discoverers
---- __NOTOC__ This is a list of German inventors and discoverers. The following list comprises people from Germany or German-speaking Europe, and also people of predominantly German heritage, in alphabetical order of the surname. For the list containing items and ideas invented and/or discovered by Germans, see list of German inventions and discoveries. A * Ernst Abbe: Invented the first refractometer, and many other devices. Donated his shares in the company Carl Zeiss to form Carl-Zeiss-Stiftung, still in existence today. * Franz Carl Achard: Developed a process to produce sugar from sugar beet. Built the first factory for the process in 1802. * Robert Adler: Invented a better television remote control. * Konrad Adenauer: Invented soya sausage (1916; "Kölner Wurst") and, together with Jean and Josef Oebel, oarsewholemeal bread (1917; Kölner Brot). * Georgius Agricola: Named "the father of mineralogy". * Wilhelm Albert: Invented the wire rope 1834. * Kurt Alder: Disc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Timeline Of The Telephone
This timeline of the telephone covers landline, radio, and cellular telephony technologies and provides many important dates in the history of the telephone. 1667 to 1875 * 1667: Robert Hooke creates an acoustic string telephone that conveys sounds over a taut extended wire by mechanical vibrations.McVeigh, Daniel P.An Early History of the Telephone: 1664-1866: Robert Hooke's Acoustic Experiments and Acoustic Inventions(archived froon 18 June 2013), Columbia University website. Retrieved 15 January 2013.Giles, Arthur (editor)County Directory of Scotland (for 1901-1904): Twelfth Issue: Telephone (Scottish Post Office Directories) Edinburgh: R. Grant & Son, 1902, p. 28. * 1844: Innocenzo Manzetti first suggests the idea of an electric "speaking telegraph", or telephone. * 1849: Antonio Meucci demonstrates a communicating device to individuals in Havana. It is disputed that this is an electromagnetic telephone, but it is said to involve direct transmission of electri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Invention Of The Telephone
The invention of the telephone was the culmination of work done by more than one individual, and led to an array of lawsuits relating to the patent claims of several individuals and numerous companies. Early development The concept of the telephone dates back to the string telephone or lover's telephone that has been known for centuries, comprising two diaphragms connected by a taut string or wire. Sound waves are carried as mechanical vibrations along the string or wire from one diaphragm to the other. The classic example is the tin can telephone, a children's toy made by connecting the two ends of a string to the bottoms of two metal cans, paper cups or similar items. The essential idea of this toy was that a diaphragm can collect voice sounds from the voice sounds for reproduction at a distance. One precursor to the development of the electromagnetic telephone originated in 1833 when Carl Friedrich Gauss and Wilhelm Eduard Weber invented an electromagnetic device for t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
History Of The Telephone
This history of the telephone chronicles the development of the electrical telephone, and includes a brief overview of its predecessors. The first telephone patent was granted to Alexander Graham Bell in 1876. Mechanical and acoustic devices Before the invention of electromagnetic telephones, mechanical acoustic devices existed for transmitting speech and music over a greater distance. This distance was greater than that of normal direct speech. The earliest mechanical telephones were based on sound transmission through pipes or other physical media. The acoustic tin can telephone, or "lovers' phone", has been known for centuries. It connects two diaphragms with a taut string or wire, which transmits sound by mechanical vibrations from one to the other along the wire (and not by a modulated electric current). The classic example is the children's toy made by connecting the bottoms of two paper cups, metal cans, or plastic bottles with tautly held string. Some of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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