Guglielmo Giovanni Maria Marconi, 1st Marquis of Marconi was an Italian inventor, electrical engineer, physicist, and politician, known for his creation of a practical radio wave–based wireless telegraph system. This led to Marconi being credited as the inventor of radio, and winning the 1909 Nobel Prize in Physics with Karl Ferdinand Braun "in recognition of their contributions to the development of wireless telegraphy". His work laid the foundation for the development of radio, television, and all modern wireless communication systems.
Karl Ferdinand Braun was a German electrical engineer, inventor, physicist and Nobel laureate in Physics. Braun contributed significantly to the development of the radio, when he invented the phased array antenna in 1905, which led to the development of radar, smart antennas, MIMO and the television by building the first cathode-ray tube. Braun also built the first semiconductor.
Wireless telegraphy or radiotelegraphy is the transmission of text messages by radio waves, analogous to electrical telegraphy using cables. Before about 1910, the term wireless telegraphy was also used for other experimental technologies for transmitting telegraph signals without wires. In radiotelegraphy, information is transmitted by pulses of radio waves of two different lengths called "dots" and "dashes", which spell out text messages, usually in Morse code. In a manual system, the sending operator taps on a switch called a telegraph key which turns the transmitter on and off, producing the pulses of radio waves. At the receiver the pulses are audible in the receiver's speaker as beeps, which are translated back to text by an operator who knows Morse code.
Amos Emerson Dolbear was an American physicist and inventor. Dolbear researched electrical spark conversion into sound waves and electrical impulses. He was a professor at University of Kentucky in Lexington from 1868 until 1874. In 1874 he became the chair of the physics department at Tufts University in Medford, Massachusetts. He is known for his 1882 invention of a system for transmitting telegraph signals without wires. In 1899 his patent for it was purchased in an unsuccessful attempt to interfere with Guglielmo Marconi's wireless telegraphy patents in the United States.
Alexander Stepanovich Popov was a Russian physicist who was one of the first people to invent a radio receiving device.
Mount Pleasant is a neighborhood in Washington, D.C., located in Northwest D.C. The neighborhood is primarily residential, with restaurants and stores centered along a commercial corridor on Mt. Pleasant Street. Mount Pleasant is known for its unique identity and multicultural landscape, home to diverse groups such as the punk rock, the Peace Corps and Hispanic Washingtonian communities.
A spark-gap transmitter is an obsolete type of radio transmitter which generates radio waves by means of an electric spark. Spark-gap transmitters were the first type of radio transmitter, and were the main type used during the wireless telegraphy or "spark" era, the first three decades of radio, from 1887 to the end of World War I. German physicist Heinrich Hertz built the first experimental spark-gap transmitters in 1887, with which he proved the existence of radio waves and studied their properties.
Poldhu is a small area in south Cornwall, England, UK, situated on the Lizard Peninsula; it comprises Poldhu Point and Poldhu Cove. Poldhu means "black pool" in Cornish. Poldhu lies on the coast of Mount's Bay and is in the northern part of the parish of Mullion; the churchtown is 2 kilometres (1.2 mi) to the south-east. On the north side of Poldhu Cove is the parish of Gunwalloe and the village of Porthleven is a further 7 kilometres (4.3 mi) to the north.
The Piccirilli brothers were an Italian family of renowned marble carvers and sculptors who carved many of the most significant marble sculptures in the United States, including Daniel Chester French’s colossal Abraham Lincoln (1920) in the Lincoln Memorial, Washington, D.C.
The invention of radio communication was preceded by many decades of establishing theoretical underpinnings, discovery and experimental investigation of radio waves, and engineering and technical developments related to their transmission and detection. These developments allowed Guglielmo Marconi to turn radio waves into a wireless communication system.
Attilio Piccirilli was an American sculptor. Born in Massa, Italy, he was educated at the Accademia di San Luca of Rome.
Sheridan Circle is a traffic circle and park in the Sheridan-Kalorama neighborhood of Washington, D.C. The traffic circle, one of two in the neighborhood, is the intersection of 23rd Street NW, Massachusetts Avenue NW, and R Street NW. The buildings along this stretch of Massachusetts Avenue NW are part of Embassy Row, which runs from Scott Circle to Observatory Circle. Sheridan Circle is a contributing property to the Massachusetts Avenue Historic District and the Sheridan-Kalorama Historic District, both listed on the National Register of Historic Places (NRHP). In addition, the equestrian statue of General Philip Sheridan is 1 of 18 Civil War Monuments in Washington, D.C., that were collectively listed on the NRHP.
Augusto Righi was an Italian physicist and a pioneer in the study of electromagnetism. He was born and died in Bologna.
The Haven Hotel is a historic AA four star hotel in Sandbanks, near Poole, Dorset on the south coast of England.
Joseph Maria Pernicone was an Italian-born clergyman of the Roman Catholic Church. He served as an auxiliary bishop of the Archdiocese of New York from 1954 to 1978.
The Luther Monument is a public artwork located in front of Luther Place Memorial Church in Washington, D.C., United States. The monument to Martin Luther, the theologian and Protestant Reformer, is a bronze, full-length portrait. It is a copy of the statue created by Ernst Friedrich August Rietschel as part of the 1868 Luther Monument in Worms, Germany. The version in Washington, D.C., inspired the installation of many other castings across the U.S. The statue is a contributing property to the Luther Place Memorial Church's listing on the National Register of Historic Places (NRHP) and District of Columbia Inventory of Historic Sites (DCIHS). It is also a contributing property to the Greater Fourteenth Street Historic District, which is also listed on the NRHP and DCIHS.
Lieutenant General George Washington is an 1860 equestrian statue of George Washington, at Washington Circle, at the edge of the George Washington University's campus, in Washington, D.C. The statue was sculpted by Clark Mills, who also created the equestrian statue of Andrew Jackson in front of the White House. The traffic circle where the statue is located was one of the original city designs by Pierre Charles L'Enfant. The statue and surrounding park are in the Foggy Bottom neighborhood at the intersection of 23rd Street, New Hampshire Avenue, and Pennsylvania Avenue NW. The K Street NW underpass runs beneath the circle.
Furio Piccirilli was an Italian-born American sculptor and one of the Piccirilli Brothers.
The Samuel Gompers Memorial is a bronze collection of statues in Washington, D.C., sited on a triangular park at the intersection of 11th Street, Massachusetts Avenue, and N Street NW. Samuel Gompers was an English-born American who grew up working in cigar factories, where he witnessed the long hours and dangerous conditions people experienced in factory jobs. He helped with growing the Cigar Makers' International Union, and a few years later, founded the American Federation of Labor (AFL). The number of members rose from 50,000 to 3,000,000 during his time as president of the union. He was not only successful in expanding the power of the labor movement, but also increased its prestige.
Elettra was the name of Guglielmo Marconi's steam yacht – a seaborne laboratory – from which he conducted his many experiments with wireless telegraphy, wireless telephony and other communication and direction-finding techniques during the inter-war period.
