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Alexanderson Alternator
An Alexanderson alternator
Alexanderson alternator
is a rotating machine invented by Ernst Alexanderson in 1904 for the generation of high-frequency alternating current for use as a radio transmitter. It was one of the first devices capable of generating the continuous radio waves needed for transmission of amplitude modulation (sound) by radio. It was used from about 1910 in a few "superpower" longwave radiotelegraphy stations to transmit transoceanic message traffic by Morse code
Morse code
to similar stations all over the world. Although obsolete by the early 1920s due to the development of vacuum-tube transmitters, the Alexanderson alternator
Alexanderson alternator
continued to be used until World War 2
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Hertz (unit)
The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units
International System of Units
(SI) and is defined as one cycle per second.[1] It is named for Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves. Hertz
Hertz
are commonly expressed in multiples: kilohertz (103 Hz, kHz), megahertz (106 Hz, MHz), gigahertz (109 Hz, GHz), and terahertz (1012 Hz, THz). Some of the unit's most common uses are in the description of sine waves and musical tones, particularly those used in radio- and audio-related applications
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Radio
Radio
Radio
is the technology of using radio waves to carry information, such as sound, by systematically modulating properties of electromagnetic energy waves transmitted through space, such as their amplitude, frequency, phase, or pulse width.[n 1] When radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can be extracted and transformed back into its original form. Radio
Radio
systems need a transmitter to modulate (change) some property of the energy produced to impress a signal on it, for example using amplitude modulation or angle modulation (which can be frequency modulation or phase modulation). Radio
Radio
systems also need an antenna to convert electric currents into radio waves, and radio waves into an electric current. An antenna can be used for both transmitting and receiving
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Brant Rock, Massachusetts
Ocean Bluff-Brant Rock is a census-designated place (CDP) in Plymouth County, Massachusetts, United States, composed of the neighborhoods of Ocean Bluff, Brant Rock, Fieldston, and Rexhame in the town of Marshfield. The population of the CDP was 4,970 at the 2010 census.[1]Contents1 History 2 Geography 3 Demographics 4 ReferencesHistory[edit] Brant Rock and Ocean Bluff were originally inhabited by Native Americans, including members of the Wampanoag tribe of the Algonquian peoples. Native American artifacts have been found extensively in the area. The main road through the area, known today as Ocean Street, is a Native American road, likely very ancient. The area at the end of Brant Rock village, known as Blackman's Point, was a Native American campground. In the 1630s, the government of the Pilgrim settlers at Plymouth began to give out land grants in the area. The Ocean Bluff area was first granted to the governor of the Pilgrims
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John Hays Hammond, Jr.
John Hays Hammond
John Hays Hammond
Jr. (April 13, 1888 – February 12, 1965) was an American inventor known as "The Father of Radio Control". Hammond’s pioneering developments in electronic remote control are the foundation for all modern radio remote control devices, including modern missile guidance systems, unmanned aerial vehicles (UAVs), and the unmanned combat aerial vehicle (UCAVs). Of Hammond’s many individual inventions, the inventions which have seen the most significant application are the variable pitch or controlled pitch propellers and single dial radio tuning.[1][2][3] He was the son of mining engineer John Hays Hammond, Sr..Contents1 Biography 2 In popular culture 3 Inventions 4 See also 5 References 6 External linksBiography[edit] Born in San Francisco, California, his family moved to South Africa and the Transvaal in 1893. His father was active as a mining engineer for Cecil Rhodes' mines in South Africa
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Gloucester, Massachusetts
Gloucester
Gloucester
/ˈɡlɒstər/ is a city on Cape Ann
Cape Ann
in Essex County, Massachusetts, in the United States. It is part of Massachusetts' North Shore. The population was 28,789 at the 2010 U.S
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New Brunswick, New Jersey
Alfred E. Smith
Alfred E. Smith
to Lew Dockstader
Lew Dockstader
in December 1923 on Dockstader's fall at what is now the State Theater.[20]New Brunswick is a city in Middlesex County, New Jersey, United States. It is the county seat of Middlesex County,[21] and the home of Rutgers University. The city is on the Northeast Corridor
Northeast Corridor
rail line, 27 miles (43 km) southwest of Manhattan, on the southern bank of the Raritan River
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Vacuum-tube
In electronics, a vacuum tube, an electron tube,[1][2][3] or just a tube (North America), or valve (Britain and some other regions) is a device that controls electric current between electrodes in an evacuated container. Vacuum
Vacuum
tubes mostly rely on thermionic emission of electrons from a hot filament or a heated cathode. This type is called a thermionic tube or thermionic valve. A phototube, however, achieves electron emission through the photoelectric effect. Not all electronic circuit valves/electron tubes are vacuum tubes (evacuated); gas-filled tubes are similar devices containing a gas, typically at low pressure, which exploit phenomena related to electric discharge in gases, usually without a heater. The simplest vacuum tube, the diode, contains only a heater, a heated electron-emitting cathode (the filament itself acts as the cathode in some diodes), and a plate (anode)
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Electronic Oscillator
An electronic oscillator is an electronic circuit that produces a periodic, oscillating electronic signal, often a sine wave or a square wave.[1][2] Oscillators convert direct current (DC) from a power supply to an alternating current (AC) signal. They are widely used in many electronic devices. Common examples of signals generated by oscillators include signals broadcast by radio and television transmitters, clock signals that regulate computers and quartz clocks, and the sounds produced by electronic beepers and video games.[1] Oscillators are often characterized by the frequency of their output signal:A low-frequency oscillator (LFO) is an electronic oscillator that generates a frequency below approximately 20 Hz
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Armstrong Oscillator
The Armstrong oscillator[1] (also known as the Meissner oscillator[2]) is an electronic oscillator circuit which uses an inductor and capacitor to generate an oscillation. It is the earliest oscillator circuit, invented by US engineer Edwin Armstrong
Edwin Armstrong
in 1912 and independently by Austrian engineer Alexander Meissner
Alexander Meissner
in 1913, and was used in the first vacuum tube radio transmitters. It is sometimes called a tickler oscillator because its distinguishing feature is that the feedback signal needed to produce oscillations is magnetically coupled into the tank inductor in the input circuit by a "tickler coil" (L2, right) in the output circuit
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Rocky Point, New York
Rocky Point is a hamlet and census-designated place (CDP) in Suffolk County, New York, on the North Shore, of Long Island. As of the 2010 United States Census, the CDP population was 14,014.[1] Rocky Point is a community in the Town of Brookhaven.Contents1 History 2 Geography 3 Demographics of the CDP 4 ReferencesHistory[edit] Rocky Point is home to the site where American radio company RCA
RCA
once operated a very large transmitting and transmitter research facility, known as Radio Central. RCA
RCA
began to transmit transatlantic radio messages from Radio Central after its opening on November 5, 1921. Early Radio Central transmissions were received by many European nations, including Britain, Spain, France, Germany, Italy, Austria, and Poland.Rocky Point LandingOn January 7, 1927, AT&T initiated the first transatlantic commercial telephone service, linking London and New York
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Nikola Tesla
Nikola Tesla
Tesla
(/ˈtɛslə/;[2] Serbian Cyrillic: Никола Тесла Serbo-Croatian pronunciation: [nikoːla tesla]; 10 July 1856 – 7 January 1943) was a Serbian-American[3][4][5] inventor, electrical engineer, mechanical engineer, physicist, and futurist who is best known for his contributions to the design of the modern alternating current (AC) electricity supply system.[6] Born and raised in the Austrian Empire, Tesla
Tesla
received an advanced education in engineering and physics in the 1870s and gained practical experience in the early 1880s working in telephony and at Continental Edison in the new electric power industry. He emigrated to the United States in 1884, where he would become a naturalized citizen. He worked for a short time at the Edison Machine Works
Edison Machine Works
in New York City
New York City
before he struck out on his own
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UNESCO
The United Nations
United Nations
Educational, Scientific and Cultural Organisation (UNESCO;[2] French: Organisation des Nations unies pour l'éducation, la science et la culture) is a specialized agency of the United Nations (UN) based in Paris
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World Heritage Site
A World Heritage Site
World Heritage Site
is a landmark or area which is selected by the United Nations
United Nations
Educational, Scientific and Cultural Organization (UNESCO) as having cultural, historical, scientific or other form of significance, and is legally protected by international treaties. The sites are judged important to the collective interests of humanity. To be selected, a World Heritage Site
World Heritage Site
must be an already classified landmark, unique in some respect as a geographically and historically identifiable place having special cultural or physical significance (such as an ancient ruin or historical structure, building, city, complex, desert, forest, island, lake, monument, mountain, or wilderness area)
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Guitar Pickup
A pickup device is a transducer (specifically a variable reluctance sensor) that captures or senses mechanical vibrations produced by musical instruments, particularly stringed instruments such as the electric guitar, electric bass guitar, Chapman Stick, or electric violin, and converts them to an electrical signal that is amplified using an instrument amplifier (such as a guitar amplifier) to produce musical sounds through a loudspeaker in a speaker enclosure. The signal from a pickup can also be recorded directly, using a DI box
DI box
(a common practice with the electric bass) or broadcast on the radio or television. Most electric guitars and electric basses use magnetic pickups
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Magnetic Field
A magnetic field is a force field that is created by moving electric charges (electric currents) and magnetic dipoles, and exerts a force on other nearby moving charges and magnetic dipoles. At any given point, it has a direction and a magnitude (or strength), so it is represented by a vector field. The term is used for two distinct but closely related fields denoted by the symbols B and H, where, in the International System of Units, H is measured in units of amperes per meter and B is measured in teslas or newtons per meter per ampere. H is a field introduced to account for the effects of magnetization, which is due to the presence of magnetic dipoles in materials
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