Radio broadcasting is transmission of audio by radio waves intended to reach a wide audience. Stations can be linked in radio networks to broadcast a common radio format, either in broadcast syndication or simulcast or both. Signals can be digital audio. Television broadcasting uses radio frequencies, but includes video signals; the earliest radio stations did not carry audio. For audio broadcasts to be possible, electronic detection and amplification devices had to be incorporated; the thermionic valve was invented in 1904 by the English physicist John Ambrose Fleming. He developed a device he called an "oscillation valve"; the heated filament, or cathode, was capable of thermionic emission of electrons that would flow to the plate when it was at a higher voltage. Electrons, could not pass in the reverse direction because the plate was not heated and thus not capable of thermionic emission of electrons. Known as the Fleming valve, it could be used as a rectifier of alternating current and as a radio wave detector.
This improved the crystal set which rectified the radio signal using an early solid-state diode based on a crystal and a so-called cat's whisker. However, what was still required was an amplifier; the triode was patented on March 4, 1906, by the Austrian Robert von Lieben independent from that, on October 25, 1906, Lee De Forest patented his three-element Audion. It wasn't put to practical use until 1912 when its amplifying ability became recognized by researchers. By about 1920, valve technology had matured to the point where radio broadcasting was becoming viable. However, an early audio transmission that could be termed a broadcast may have occurred on Christmas Eve in 1906 by Reginald Fessenden, although this is disputed. While many early experimenters attempted to create systems similar to radiotelephone devices by which only two parties were meant to communicate, there were others who intended to transmit to larger audiences. Charles Herrold started broadcasting in California in 1909 and was carrying audio by the next year..
In The Hague, the Netherlands, PCGG started broadcasting on November 6, 1919, making it, arguably the first commercial broadcasting station. In 1916, Frank Conrad, an electrical engineer employed at the Westinghouse Electric Corporation, began broadcasting from his Wilkinsburg, Pennsylvania garage with the call letters 8XK; the station was moved to the top of the Westinghouse factory building in East Pittsburgh, Pennsylvania. Westinghouse relaunched the station as KDKA on November 2, 1920, as the first commercially licensed radio station in America; the commercial broadcasting designation came from the type of broadcast license. The first licensed broadcast in the United States came from KDKA itself: the results of the Harding/Cox Presidential Election; the Montreal station that became CFCF began broadcast programming on May 20, 1920, the Detroit station that became WWJ began program broadcasts beginning on August 20, 1920, although neither held a license at the time. In 1920, wireless broadcasts for entertainment began in the UK from the Marconi Research Centre 2MT at Writtle near Chelmsford, England.
A famous broadcast from Marconi's New Street Works factory in Chelmsford was made by the famous soprano Dame Nellie Melba on 15 June 1920, where she sang two arias and her famous trill. She was the first artist of international renown to participate in direct radio broadcasts; the 2MT station began to broadcast regular entertainment in 1922. The BBC was amalgamated in 1922 and received a Royal Charter in 1926, making it the first national broadcaster in the world, followed by Czech Radio and other European broadcasters in 1923. Radio Argentina began scheduled transmissions from the Teatro Coliseo in Buenos Aires on August 27, 1920, making its own priority claim; the station got its license on November 19, 1923. The delay was due to the lack of official Argentine licensing procedures before that date; this station continued regular broadcasting of entertainment and cultural fare for several decades. Radio in education soon followed and colleges across the U. S. began adding radio broadcasting courses to their curricula.
Curry College in Milton, Massachusetts introduced one of the first broadcasting majors in 1932 when the college teamed up with WLOE in Boston to have students broadcast programs. A radio broadcasting station is associated with wireless transmission, though in practice broadcasting transmission take place using both wires and radio waves; the point of this is that anyone with the appropriate receiving technology can receive the broadcast. In line to ITU Radio Regulations each broadcasting station shall be classified by the service in which it operates permanently or temporarily. Broadcasting by radio takes several forms; these include FM stations. There are several subtypes, namely commercial broadcasting, non-commercial educational public broadcasting and non-profit varieties as well as community radio, student-run campus radio stations, hospital radio stations can be found throughout the world. Many stations broadcast on shortwave bands using AM technology that can be received over thousands of miles.
For example, the BBC, VOA, VOR, Deutsche Welle have transmitted via shortwave to Africa and Asia. These broadcasts are sensitive to atmospheric conditions and solar activity. Nielsen Audio known as Arbitron, the United States-based company that reports on radio audiences, defines a "radio station" as a gove
Radcliffe College was a women's liberal arts college in Cambridge and functioned as the female coordinate institution for the all-male Harvard College. It was one of the Seven Sisters colleges and held the popular reputation of having a intellectual and independent-minded female student body. Radcliffe conferred Radcliffe College diplomas to undergraduates and graduate students for the first 70 years of its history and joint Harvard-Radcliffe diplomas to undergraduates beginning in 1963. A formal "non-merger merger" agreement with Harvard was signed in 1977, with full integration with Harvard completed in 1999. Today, within Harvard University, Radcliffe's former administrative campus is home to the Radcliffe Institute for Advanced Study, former Radcliffe housing at the Radcliffe Quadrangle has been incorporated into the Harvard College house system. Under the terms of the 1999 consolidation, the Radcliffe Yard and the Radcliffe Quadrangle retain the "Radcliffe" designation in perpetuity; the "Harvard Annex," a private program for the instruction of women by Harvard faculty, was founded in 1879 after prolonged efforts by women to gain access to Harvard College.
Arthur Gilman, Cambridge resident, banker and writer, was the founder of what became The Annex/Radcliffe. At a time when higher education for women was a controversial topic, Gilman hoped to establish a higher educational opportunity for his daughter that exceeded what was available in female seminaries and the new women's colleges such as Vassar and Wellesley, most of which in their early years had substantial numbers of faculty who were not university trained. In conversations with the chair of Harvard's classics department, he outlined a plan to have Harvard faculty deliver instruction to a small group of Cambridge and Boston women, he approached Harvard President Charles William Eliot with the idea and Eliot approved. Gilman and Eliot recruited a group of prominent and well-connected Cambridge women to manage the plan; these women were Elizabeth Cary Agassiz, Mary H. Cooke, Stella Scott Gilman, Mary B. Greenough, Ellen Hooper Gurney, Alice Mary Longfellow and Lillian Horsford. Building upon Gilman's premise, the committee convinced 44 members of the Harvard faculty to consider giving lectures to female students in exchange for extra income paid by the committee.
The program came to be known informally as "The Harvard Annex." The course of study for the first year included 51 courses in 13 subject areas, an "impressive curriculum with greater diversity than that of any other women's college at its inception. Courses were offered in Greek, English, French and Spanish; the first graduation ceremonies took place in the library of Longfellow House on Brattle Street, just above where George Washington's generals had slept a century earlier. The committee members hoped that by raising an enticing endowment for The Annex they would be able to convince Harvard to admit women directly into Harvard College. However, the university resisted. In his inaugural address as president of Harvard in 1869, Charles Eliot summed up the official Harvard position toward female students when he said, "The world knows next to nothing about the capacities of the female sex. Only after generations of civil freedom and social equality will it be possible to obtain the data necessary for an adequate discussion of woman's natural tendencies and capabilities...
It is not the business of the University to decide this mooted point." In a similar vein, when confronted with the notion of females receiving Harvard degrees in 1883, the University's treasurer stated, "I have no prejudice in the matter of education of women and am quite willing to see Yale or Columbia take any risks they like, but I feel bound to protect Harvard College from what seems to me a risky experiment."Some of President Eliot's objections stemmed from 19th century notions of propriety. He was against co-education, commenting that "The difficulties involved in a common residence of hundreds of young men and women of immature character and marriageable age are grave; the necessary police regulations are exceedingly burdensome." The committee persevered despite Eliot's skepticism. Indeed, the project proved attracting a growing number of students; as a result, the Annex was incorporated in 1882 as the Society for the Collegiate Instruction of Women, with Elizabeth Cary Agassiz, widow of Harvard professor Louis Agassiz, as president.
This Society did not have the power to confer academic degrees. In subsequent years, on-going discussions with Harvard about admitting women directly into the university still came to a dead end, instead Harvard and the Annex negotiated the creation of a degree-granting institution, with Harvard professors serving as its faculty and visiting body; this modification of the Annex was chartered by the Commonwealth of Massachusetts as Radcliffe College in 1894, the eponym being early Harvard benefactor Lady Ann Mowlson. The Boston Globe reported "President of Harvard To Sign Parchments of the Fair Graduates"). Students seeking admission to the new women's college were required to sit for the same entrance examinations required of Harvard students. By 1896, the Globe could headline a story: "Sweet Girls, they Graduate in Shoals at Radcliffe. Commencement Exercises at Sanders Theatre. Galleries Filled with Students. Handsome Mrs. Agassiz Made Fine Address. Pres Eliot Commends the Work of the New Institution."
The Globe said "Eliot stated that the percentage of graduates with dis
The National Warning System is an automated telephone system used to convey warnings to United States-based federal and local governments, as well as the military and civilian population. The original mission of NAWAS was to warn of an imminent enemy attack or an actual accidental missile launch upon the United States. NAWAS still supports this mission but the emphasis is on natural and technological disasters. Organizations are able to disseminate and coordinate emergency alerts and warning messages through NAWAS and other public systems by means of the Integrated Public Alert and Warning System. NAWAS is operated and funded by the Federal Emergency Management Agency. Today, the system consists of what is a 2200+ telephone party line; the phone instruments are designed to provide protection for lightning strikes so they may be used during storms. The interconnecting lines provide some protection by avoiding local telephone switches; this ensures they are available when the local system is down or overloaded.
NAWAS has major terminals at each state Emergency Operations Center and State Emergency Management Facility. Other secondary terminals include local emergency management agencies, National Weather Service field offices and Public-safety answering points. NAWAS is used to disseminate warning information concerning natural and technological disasters to 2200 warning points throughout the continental United States, Alaska and the Virgin Islands; this information includes acts of terrorism including Weapons of Mass Destruction after aircraft incidents/accidents, floods, nuclear incidents/accidents, severe thunderstorms, tornadoes and winter storms/blizzards. NAWAS allows issuance of warnings to all stations nationwide or to selected stations as dictated by the situation; when the NAWAS is not being used for emergency traffic/tests and local government personnel are encouraged to use it for official business. Emergency Alert System Integrated Public Alert and Warning System NOAA Weather Radio Integrated Public Alert and Warning System FEMA National Warning System Operations Manual NWS policy reference regarding NAWAS