Classe préparatoire aux grandes écoles
The classes préparatoires aux grandes écoles called classes prépas or prépas, are part of the French post-secondary education system. They consist of two years of study which act as a preparatory course with the main goal of training students for enrolment in one of the grandes écoles; the workload is one of the highest in Europe. Unlike most students in France who enroll in public universities directly after receiving a high school diploma, students from CPGE have to take national competitive exams to be allowed to enrol in one of the Grandes Écoles; these Grandes Écoles are higher education establishments delivering master's degrees and/or doctorates. They include science and engineering schools, business schools, the four veterinary colleges and the four écoles normales supérieures but do not include medical or law schools, nor architecture schools, their competitive entrance exams make having attended one of the grandes écoles being regarded as a status symbol as they have traditionally produced most of France's scientists and intellectuals.
Hence, there are three kinds of different prépas: scientific and literary CPGE. Each of them prepare to pass the competitive exams of those grandes écoles; the CPGE are located within high schools for historical reasons but pertain to tertiary education, which means that each student must have passed their baccalauréat to be admitted to CPGE. Moreover, the admission to the CPGE is based on performance during the last two years of high school, called première and terminale. Thus, each CPGE receives hundreds of applications from around the world every April and May, selects its new students under its own criteria. A few CPGE programmes the private CPGEs have an interview process or look at a student's involvement in the community. In June 2007, 534,300 students passed the "Baccalauréat", 40,000 of them were admitted to CPGE. On a given class at one of the prep schools listed above, around 1500 application files will be examined for only 40 places. Students are selected according to their grades in High school and the first part of "Baccalauréat".
Preparatory classes are not authorized to deliver any degrees, but they give ECTS credits that can be used to fulfill university degree requirements since the 2009-2010 academic year, students who decide to can carry on their studies at a public university. However, many prépas establish conventions with universities to validate a full 2nd or 3rd year degree upon graduation for CPGE students who perform well in literary prépas. Most of the students in these classes receive part of their education at a public university, so that the teachers' council can deliver them the corresponding grade in one or two disciplines at the end of the year. CPGE exist in three different fields of study: science & engineering and humanities. All CPGE programs have a nominal duration of two years, but the second year is sometimes repeated once; the oldest CPGEs are the scientific ones. The different tracks are the following: MPSI, Mathématiques, Sciences de l'Ingénieur in the first year, followed by either MP or PSI PCSI, chimie, sciences de l'ingénieur in the first year, followed by PC or PSI PTSI, technologie, sciences de l'ingénieur in the first year, followed by PT or PSI TPC1, physique et chimie in the first year, followed by TPC2 TSI1, Technologie, sciences industrielles in the first year, followed by TSI2 BCPST1, Chimie, sciences de la terre in the first year, followed by BCPST2 TB1, biologie in the first year, followed by TB2The classes that train students for admission to the elite schools, such as Écoles Normales Supérieures or ParisTech schools, have an asterisk added to their name.
For example, MP*, are called MP étoile. Both the first and second year programmes include as much as ten to twelve hours of mathematics teaching per week, ten hours of physics, two hours of literature and philosophy, two to four hours of foreign language teaching and two to eight hours of minor options: either SI, engineering industrial science, chemistry or theoretical computer science, biology-geology, biotechnologies. Added to this are several hours of homework, which can amount to as much as the official hours of class; the BCPST classes prepare for exams of engineering sc
Computer science is the study of processes that interact with data and that can be represented as data in the form of programs. It enables the use of algorithms to manipulate and communicate digital information. A computer scientist studies the theory of computation and the practice of designing software systems, its fields can be divided into practical disciplines. Computational complexity theory is abstract, while computer graphics emphasizes real-world applications. Programming language theory considers approaches to the description of computational processes, while computer programming itself involves the use of programming languages and complex systems. Human–computer interaction considers the challenges in making computers useful and accessible; the earliest foundations of what would become computer science predate the invention of the modern digital computer. Machines for calculating fixed numerical tasks such as the abacus have existed since antiquity, aiding in computations such as multiplication and division.
Algorithms for performing computations have existed since antiquity before the development of sophisticated computing equipment. Wilhelm Schickard designed and constructed the first working mechanical calculator in 1623. In 1673, Gottfried Leibniz demonstrated a digital mechanical calculator, called the Stepped Reckoner, he may be considered the first computer scientist and information theorist, among other reasons, documenting the binary number system. In 1820, Thomas de Colmar launched the mechanical calculator industry when he released his simplified arithmometer, the first calculating machine strong enough and reliable enough to be used daily in an office environment. Charles Babbage started the design of the first automatic mechanical calculator, his Difference Engine, in 1822, which gave him the idea of the first programmable mechanical calculator, his Analytical Engine, he started developing this machine in 1834, "in less than two years, he had sketched out many of the salient features of the modern computer".
"A crucial step was the adoption of a punched card system derived from the Jacquard loom" making it infinitely programmable. In 1843, during the translation of a French article on the Analytical Engine, Ada Lovelace wrote, in one of the many notes she included, an algorithm to compute the Bernoulli numbers, considered to be the first computer program. Around 1885, Herman Hollerith invented the tabulator, which used punched cards to process statistical information. In 1937, one hundred years after Babbage's impossible dream, Howard Aiken convinced IBM, making all kinds of punched card equipment and was in the calculator business to develop his giant programmable calculator, the ASCC/Harvard Mark I, based on Babbage's Analytical Engine, which itself used cards and a central computing unit; when the machine was finished, some hailed it as "Babbage's dream come true". During the 1940s, as new and more powerful computing machines were developed, the term computer came to refer to the machines rather than their human predecessors.
As it became clear that computers could be used for more than just mathematical calculations, the field of computer science broadened to study computation in general. In 1945, IBM founded the Watson Scientific Computing Laboratory at Columbia University in New York City; the renovated fraternity house on Manhattan's West Side was IBM's first laboratory devoted to pure science. The lab is the forerunner of IBM's Research Division, which today operates research facilities around the world; the close relationship between IBM and the university was instrumental in the emergence of a new scientific discipline, with Columbia offering one of the first academic-credit courses in computer science in 1946. Computer science began to be established as a distinct academic discipline in the 1950s and early 1960s; the world's first computer science degree program, the Cambridge Diploma in Computer Science, began at the University of Cambridge Computer Laboratory in 1953. The first computer science degree program in the United States was formed at Purdue University in 1962.
Since practical computers became available, many applications of computing have become distinct areas of study in their own rights. Although many believed it was impossible that computers themselves could be a scientific field of study, in the late fifties it became accepted among the greater academic population, it is the now well-known IBM brand that formed part of the computer science revolution during this time. IBM released the IBM 704 and the IBM 709 computers, which were used during the exploration period of such devices. "Still, working with the IBM was frustrating if you had misplaced as much as one letter in one instruction, the program would crash, you would have to start the whole process over again". During the late 1950s, the computer science discipline was much in its developmental stages, such issues were commonplace. Time has seen significant improvements in the effectiveness of computing technology. Modern society has seen a significant shift in the users of computer technology, from usage only by experts and professionals, to a near-ubiquitous user base.
Computers were quite costly, some degree of humanitarian aid was needed for efficient use—in part from professional computer operators. As computer adoption became more widespread and affordable, less human assistance was needed for common usage. Despite its short history as a formal academic discipline, computer science has made a number of fundamental contributions to science and society—in fact, along with electronics, it is
Aerospace Valley is a French cluster of aerospace engineering companies and research centres. The cluster is located in the regions of Occitanie and Nouvelle Aquitaine in the southwest of France and is concentrated in and around the cities of Bordeaux and Toulouse; the over 500 affiliated companies are responsible for some 120,000 jobs in the aviation and space flight industries. In addition, some 8,500 researchers are active within the affiliated institutions; the cluster's stated aim is to create 40,000 - 45,000 new jobs by 2026. Since its inception in 2005, the cluster has initiated some 220 research projects with a total budget of 460 million euros, including 204 million euros in government funding; the headquarters of Aerospace Valley is located in Toulouse. Chair of the cluster is Jean-Marc Thomas, vicechair of Airbus France. Key locations of the cluster include: The "Aerospace Campus" in Toulouse with the aviation schools ISAE and ENAC and over 1000 researchers at ONERA, CNRS, CNES, among others.
The Université Paul Sabatier, INSA Toulouse, INPT are part of this concentration of research and training facilities in and around Toulouse. A new aerospace research laboratory of the INRIA in Bordeaux A research centre adjacent to Turbomeca in Bordes for aerospace fuel research An experimental centre in Tarbes to study better ways of dismantling civil and military aircraft. Aerospace Valley is a member of the European Aviation Clusters Partnership and of Institut au service du spatial, de ses applications et technologies. Air-Cobot, project of the Aerospace Valley cluster French space program Aerospace Valley brochure Website of Aerospace Valley
University of Bordeaux
The University of Bordeaux was founded in 1441 in France. The University of Bordeaux is part of the Community of universities and higher education institutions of Aquitaine; the original Université de Bordeaux was established by the papal bull of Pope Eugene IV on 7 June 1441 when Bordeaux was an English town. The initiative for the creation of the university is attributed to Archbishop Pey Berland, it was composed of four faculties: arts, medicine and theology. The law faculty split into faculties of civil law and canon law. A professorship in mathematics was founded in 1591 by Bishop François de Foix, son of Gaston de Foix, Earl of Kendal; this university was disestablished in 1793, was re-founded on 10 July 1896. In 1970 the university was split into three universities: Bordeaux 1, Bordeaux 2, Bordeaux 3. In 1995, Bordeaux 4 split off from Bordeaux 1. In 2007 the universities were grouped together as Communauté d'universités et établissements d'Aquitaine From 1 January 2014, the university of Bordeaux were reunited, except for Bordeaux 3 which chose not to take part to the merger.
Geoffrey Keating, Irish historian Léon Duguit, French scholar of public law Henri Moysset, French historian and politician Jacques Ellul, French philosopher, lay theologian, professor James Joll, British historian and university lecturer Théophile Obenga, Congolese Egyptologist Spencer C. Tucker, American military historian Charles Butterworth, American political philosopher Helene Hagan, Moroccan–American anthropologist and Amazigh activist Pascal Salin, French economist and professor Marie-France Vignéras, French mathematician Alfredo Co, Filipino Sinologist Idowu Bantale Omole, Nigerian professor and academic administrator Aubrey Willis Williams, American social and civil rights activist Jean-Claude Bajeux, Haitian political activist and professor Louis Clayton Jones, African-American international attorney and civil rights leader Mireille Gillings, French Canadian neurobiologist and entrepreneur Thomas Barclay, Scottish jurist and professor James Marshall Sprouse, United States Circuit judge François Mauriac French novelist, critic, poet and Nobel Laureate Saint-John Perse, French poet-diplomat Lucien Xavier Michel-Andrianarahinjaka, Malagasy writer and politician Esther Seligson, Mexican writer, poet and historian Lee Mallory, American poet and academic Marc Saikali, Lebanese–French journalist Sarah Ladipo Manyika, British Nigerian writer Luc Plissonneau, French screenwriter and film director Morteza Heidari, Iranian TV presenter Jean Baptiste Gay, vicomte de Martignac, French statesman Jean Ybarnégaray, Basque–French politician Jean-Fernand Audeguil, French politician Michel Kafando, Burkinabé diplomat Xavier Darcos, French politician, civil servant and former Minister of Labour Jean-Paul Gonzalez, French virologist Mario Aoun, Lebanese politician Alain Vidalies, the French Secretary of State for Transport, the Sea and Fisheries Nagoum Yamassoum, Chadian politician and former Prime Minister of Chad Anicet-Georges Dologuélé, Central African politician Reza Taghipour, Iranian conservative politician Thierry Santa, French Polynesian politician in New Caledonia Germaine Kouméalo Anaté, Togolese government minister and writer Olivier Falorni, French politician Myriam El Khomri, French politician Joseph-Ignace Guillotin, French physician and freemason and namesake of the guillotine Célestin Sieur, French physician Charles-Joseph Marie Pitard, French pharmacist and botanist Pierre-Paul Grassé, French zoologist Émile Peynaud, French oenologist Laure Gatet, French pharmacist and spy Basile Adjou Moumouni, Beninese physician Roland Paskoff, French geologist Jean-Marie Tarascon, French chemist and professor Bruno Vallespir, French engineer and professor Jean-Pierre Escalettes, French retired footballer Karounga Keïta, Malian football official and former coach and player Bixente Lizarazu, Basque–French retired footballer Charles James, English-American fashion designer List of medieval universities Le projet Babord-Num
École Centrale Paris
École Centrale Paris was a French postgraduate-level institute of research and higher education in engineering and science. It was known by its official name École Centrale des Arts et Manufactures. Founded in 1829, it was among the most selective grandes écoles. Rooted in rich entrepreneurial tradition since the industrial revolution era, it served as the cradle for top-level engineers and executives who continue to constitute a major part of the industry leadership in France. Since the 19th century, its model of education for training generalist engineers inspired the establishment of several engineering institutes around the world, such as the École Polytechnique Fédérale de Lausanne in Switzerland, Faculté polytechnique de Mons in Belgium, as well as other member schools of the Ecole Centrales Group alliance in France, Morocco and India. In 2015, École Centrale Paris merged with Supélec to form CentraleSupélec, a constituent institute of the University of Paris-Saclay. "Between 1832 and 1870, the Central School of Arts and Manufactures produced 3,000 engineers, served as a model for most of the industrialized countries."
École Centrale des Arts et Manufactures was founded in 1829 as a private institute by Alphonse Lavallée, a lawyer and a prominent businessman from Nantes, who put forward most of his personal capital into founding the school, together with three top scientists who became its founding associates: Eugène Peclet, Jean-Baptiste Dumas, Théodore Olivier. Notably, Lavallée was a shareholder of Le Globe, which became in 1831 the official organ of the Saint-Simonian movement; the founding vision of École Centrale was to train multidisciplinary engineers who will become the first "doctors of factories and mills" of the then-emerging industrial sector in France, at a time when most of the other engineering schools trained students for public service. As the scientific discoveries in this era were beginning to have a major impact on industrial development in Europe, a new breed of engineers with a broad and rigorous knowledge of sciences and mathematics were needed in order for France to develop its industry and compete amongst the world's superpowers.
The school was located in various premises in Paris, including Hotel Salé and buildings which now belong to Conservatoire National des Arts et Métiers. Lavallée served as the first president of École Centrale. In 1857, Lavallée transferred the ownership of the school to the French state in order to ensure its sustainability. Under Napoleon's initiative for an imperial university, the school was temporarily renamed as École Impériale des Arts et Manufactures. In 1862, graduates of the school were awarded accredited graduate diplomas in engineering, with the official academic title of'ingénieur des arts et manufactures', the first of its kind in France; the school was transferred in 1969 to a new campus located in Châtenay-Malabry. The Châtenay-Malabry campus was designed by architect Jean Fayeton, was inaugurated by President Georges Pompidou, accompanied on this occasion by Robert Galley; the school was renamed as École Centrale des Arts et Manufactures. In 2015, the school formed a strategic alliance with Supélec to create CentraleSupélec, part of the University of Paris-Saclay.
The new campus is located in Gif-sur-Yvette 20 km from the center of Paris. École Centrale Paris was one of the Centrale Graduate Schools associated as the Groupe Centrale network with its sister institutes. Since 1837, the school had established several international partnerships with the world's leading universities, such as California Institute of Technology, University of Cambridge, ETH Zurich, Georgia Institute of Technology, Harvard University, Indian Institutes of Technology, KAIST, Princeton University, Universidad Politécnica de Madrid, Massachusetts Institute of Technology, Politecnico di Milano, National University of Singapore, Stanford University, University of Toronto, Tsinghua University, TU Delft and Technische Universität München, it was a founding member of the TIME network among top engineering schools in Europe, a member of the UniverSud Paris and the CESAER association of European engineering schools. Located in the Hôtel de Juigné, the main campus of the school was transferred to rue Montgolfier in 1884, where it stayed until 1969.
Its current location neighbours the Parc de Sceaux. Former location of the École Centrale, rue Montgolfier in Paris: The school is now located at Châtenay-Malabry, Hauts-de-Seine, a southern suburb of Paris, next to the Parc de Sceaux and its Château de Sceaux. Within the main campus at Châtenay Malabry, ECP hosts eight laboratories: Molecular and Macroscopic Energy, Combustion System Analysis and Macroeconomics Modeling Industrial Engineering Chemical Engineering and Materials Processing Laboratory Applied Mathematics Soil and Structure Mechanics Technology and Strategy Solids Structure and PropertiesMost of the 2000 students at École Centrale Paris stay in dedicated on-campus student residences, located near the research labs and accessible via public transport. Following the merger of the school with Supelec, now forming CentraleSupelec, the progressive move of the campus has started from Chatenay-Malabry to Gif-sur-Yvette. Most French students who were admitted to École Centrale Paris had completed 2 to 3 years of post high school education in sciences through the classes préparatoires or
Bordeaux is a port city on the Garonne in the Gironde department in Southwestern France. The municipality of Bordeaux proper has a population of 252,040. Together with its suburbs and satellite towns, Bordeaux is the centre of the Bordeaux Métropole. With 1,195,335 in the metropolitan area, it is the sixth-largest in France, after Paris, Lyon and Lille, it is the capital of the Nouvelle-Aquitaine region, as well as the prefecture of the Gironde department. Its inhabitants are called "Bordelais" or "Bordelaises"; the term "Bordelais" may refer to the city and its surrounding region. Being at the center of a major wine-growing and wine-producing region, Bordeaux remains a prominent powerhouse and exercises significant influence on the world wine industry although no wine production is conducted within the city limits, it is home to the world's main wine fair and the wine economy in the metro area takes in 14.5 billion euros each year. Bordeaux wine has been produced in the region since the 8th century.
The historic part of the city is on the UNESCO World Heritage List as "an outstanding urban and architectural ensemble" of the 18th century. After Paris, Bordeaux has the highest number of preserved historical buildings of any city in France. In historical times, around 567 BC it was the settlement of a Celtic tribe, the Bituriges Vivisci, who named the town Burdigala of Aquitanian origin; the name Bourde is still the name of a river south of the city. In 107 BC, the Battle of Burdigala was fought by the Romans who were defending the Allobroges, a Gallic tribe allied to Rome, the Tigurini led by Divico; the Romans were defeated and their commander, the consul Lucius Cassius Longinus, was killed in the action. The city fell under Roman rule around its importance lying in the commerce of tin and lead, it became capital of Roman Aquitaine, flourishing during the Severan dynasty. In 276 it was sacked by the Vandals. Further ravage was brought by the same Vandals in 409, the Visigoths in 414, the Franks in 498, beginning a period of obscurity for the city.
In the late 6th century, the city re-emerged as the seat of a county and an archdiocese within the Merovingian kingdom of the Franks, but royal Frankish power was never strong. The city started to play a regional role as a major urban center on the fringes of the newly founded Frankish Duchy of Vasconia. Around 585, Gallactorius is fighting the Basque people; the city was plundered by the troops of Abd er Rahman in 732 after they stormed the fortified city and overwhelmed the Aquitanian garrison. Duke Eudes mustered a force ready to engage the Umayyads outside Bordeaux taking them on in the Battle of the River Garonne somewhere near the river Dordogne; the battle had a high death toll. Although Eudes was defeated here, he saved part of his troops and kept his grip on Aquitaine after the Battle of Poitiers. In 735, the Aquitanian duke Hunald led a rebellion after his father Eudes's death, at which Charles responded by sending an expedition that captured and plundered Bordeaux again, but did not retain it for long.
The following year, the Frankish commander descended again to Aquitaine, but clashed in battle with the Aquitanians and left to take on hostile Burgundian authorities and magnates. In 745, Aquitaine faced yet another expedition by Charles's sons Pepin and Carloman, against Hunald, the Aquitanian princeps strong in Bordeaux. Hunald was defeated, his son Waifer replaced him, confirmed Bordeaux as the capital city. During the last stage of the war against Aquitaine, it was one of Waifer's last important strongholds to fall to King Pepin the Short's troops. Next to Bordeaux, Charlemagne built the fortress of Fronsac on a hill across the border with the Basques, where Basque commanders came over to vow loyalty to him. In 778, Seguin was appointed count of Bordeaux undermining the power of the Duke Lupo, leading to the Battle of Roncevaux Pass that year. In 814, Seguin was made Duke of Vasconia, but he was deposed in 816 for failing to suppress or sympathise with a Basque rebellion. Under the Carolingians, sometimes the Counts of Bordeaux held the title concomitantly with that of Duke of Vasconia.
They were meant to keep the Basques in check and defend the mouth of the Garonne from the Vikings when the latter appeared c. 844 in the region of Bordeaux. In Autumn 845, count Seguin II marched on the Vikings, who were assaulting Bordeaux and Saintes, but he was captured and executed. No bishops were mentioned during part of the 9th in Bordeaux. From the 12th to the 15th century, Bordeaux regained importance following the marriage of Duchess Eléonore of Aquitaine with the French-speaking Count Henri Plantagenet, born in Le Mans, who became, within months of their wedding, King Henry II of England; the city flourished due to the wine trade, the cathedral of St. André was built, it was the capital of an independent state under Edward, the Black Prince, but in the end, after the Battle of Castillon, it was annexed by France which extended its territory. The Château Trompette and the Fort du Hâ, built by Charles VII of France, were the symbols of the new domination, which however deprived the city of its wealth by halting the wine commerce with England.
In 1462, Bordeaux obtained a parliament, but regained importance only in the 16th century when it became the centre of the distribution of sugar and slaves from the West Indies along with the traditional wine. Bordeaux adhered to the Fronde
Telecommunication is the transmission of signs, messages, writings and sounds or information of any nature by wire, optical or other electromagnetic systems. Telecommunication occurs when the exchange of information between communication participants includes the use of technology, it is transmitted either electrically over physical media, such as cables, or via electromagnetic radiation. Such transmission paths are divided into communication channels which afford the advantages of multiplexing. Since the Latin term communicatio is considered the social process of information exchange, the term telecommunications is used in its plural form because it involves many different technologies. Early means of communicating over a distance included visual signals, such as beacons, smoke signals, semaphore telegraphs, signal flags, optical heliographs. Other examples of pre-modern long-distance communication included audio messages such as coded drumbeats, lung-blown horns, loud whistles. 20th- and 21st-century technologies for long-distance communication involve electrical and electromagnetic technologies, such as telegraph and teleprinter, radio, microwave transmission, fiber optics, communications satellites.
A revolution in wireless communication began in the first decade of the 20th century with the pioneering developments in radio communications by Guglielmo Marconi, who won the Nobel Prize in Physics in 1909, other notable pioneering inventors and developers in the field of electrical and electronic telecommunications. These included Charles Wheatstone and Samuel Morse, Alexander Graham Bell, Edwin Armstrong and Lee de Forest, as well as Vladimir K. Zworykin, John Logie Baird and Philo Farnsworth; the word telecommunication is a compound of the Greek prefix tele, meaning distant, far off, or afar, the Latin communicare, meaning to share. Its modern use is adapted from the French, because its written use was recorded in 1904 by the French engineer and novelist Édouard Estaunié. Communication was first used as an English word in the late 14th century, it comes from Old French comunicacion, from Latin communicationem, noun of action from past participle stem of communicare "to share, divide out.
Homing pigeons have been used throughout history by different cultures. Pigeon post had Persian roots, was used by the Romans to aid their military. Frontinus said; the Greeks conveyed the names of the victors at the Olympic Games to various cities using homing pigeons. In the early 19th century, the Dutch government used the system in Sumatra, and in 1849, Paul Julius Reuter started a pigeon service to fly stock prices between Aachen and Brussels, a service that operated for a year until the gap in the telegraph link was closed. In the Middle Ages, chains of beacons were used on hilltops as a means of relaying a signal. Beacon chains suffered the drawback that they could only pass a single bit of information, so the meaning of the message such as "the enemy has been sighted" had to be agreed upon in advance. One notable instance of their use was during the Spanish Armada, when a beacon chain relayed a signal from Plymouth to London. In 1792, Claude Chappe, a French engineer, built the first fixed visual telegraphy system between Lille and Paris.
However semaphore suffered from the need for skilled operators and expensive towers at intervals of ten to thirty kilometres. As a result of competition from the electrical telegraph, the last commercial line was abandoned in 1880. On 25 July 1837 the first commercial electrical telegraph was demonstrated by English inventor Sir William Fothergill Cooke, English scientist Sir Charles Wheatstone. Both inventors viewed their device as "an improvement to the electromagnetic telegraph" not as a new device. Samuel Morse independently developed a version of the electrical telegraph that he unsuccessfully demonstrated on 2 September 1837, his code was an important advance over Wheatstone's signaling method. The first transatlantic telegraph cable was completed on 27 July 1866, allowing transatlantic telecommunication for the first time; the conventional telephone was invented independently by Alexander Bell and Elisha Gray in 1876. Antonio Meucci invented the first device that allowed the electrical transmission of voice over a line in 1849.
However Meucci's device was of little practical value because it relied upon the electrophonic effect and thus required users to place the receiver in their mouth to "hear" what was being said. The first commercial telephone services were set-up in 1878 and 1879 on both sides of the Atlantic in the cities of New Haven and London. Starting in 1894, Italian inventor Guglielmo Marconi began developing a wireless communication using the newly discovered phenomenon of radio waves, showing by 1901 that they could be transmitted across the Atlantic Ocean; this was the start of wireless telegraphy by radio. Voice and music had little early success. World War I accelerated the development of radio for military communications. After the war, commercial radio AM broadcasting began in the 1920s and became an important mass medium for entertainment and news. World War II again accelerated development of radio for the wartime purposes of aircraft and land communication, radio navigation and radar. Development of stereo FM broadcasting of radio