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Military Radio Antenna Kites
Radio antenna kites are used to carry a radio antenna aloft, higher than is practical with a mast. They are most often associated with portable radio systems, usually with pre- World War I field equipment, and were also occasionally used to increase radio range on Naval ships. The use of kite supported antennae was limited because of difficulty in maintaining consistent antenna height, unpredictability of the wind, and improvements in radio antenna, transmission, and reception. During World War II and after they were used in conjunction with survival radios issued to aircraft flying over-water missions. History Before their radio use, kites were used by the United States and other nations' armed forces for observation, aerial photography, and signaling. They were used non-militarily to hoist radio antennae at least since 1898 when Greenleaf Whittier Pickard used a small box kite, normally used for meteorological observations, to raise a wire half a mile up for wireless tests ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kite Used By The Signal Corps
A kite is a tethered heavier-than-air or lighter-than-air craft with wing surfaces that react against the air to create lift and drag forces. A kite consists of wings, tethers and anchors. Kites often have a bridle and tail to guide the face of the kite so the wind can lift it. Some kite designs don’t need a bridle; box kites can have a single attachment point. A kite may have fixed or moving anchors that can balance the kite. The name is derived from kite, the hovering bird of prey. The lift that sustains the kite in flight is generated when air moves around the kite's surface, producing low pressure above and high pressure below the wings. The interaction with the wind also generates horizontal drag along the direction of the wind. The resultant force vector from the lift and drag force components is opposed by the tension of one or more of the lines or tethers to which the kite is attached. The anchor point of the kite line may be static or moving (e.g., the towin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spark-gap Transmitter
A spark-gap transmitter is an obsolete type of radio transmitter which generates radio waves by means of an electric spark."Radio Transmitters, Early" in 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. A fundamental limitation of spark-gap transmitters is that they generate a series of brief transient pulses of radio waves called damped waves; they are unable to produce the continuous waves used to carry audio (sound) in modern AM or FM radio transmission. So spark-gap transmitters could not transmit audio, and instead transmitted information by radiotelegraphy; the operator switched the transmitter on and off with a telegraph key, creating pulses ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Samuel Franklin Cody
Samuel Franklin Cowdery (later known as Samuel Franklin Cody; 6 March 1867 – 7 August 1913, born Davenport, Iowa, USA)) was a Wild West showman and early pioneer of manned flight. He is most famous for his work on the large kites known as ''Cody War-Kites'', that were used by the British before World War I as a smaller alternative to balloons for artillery spotting. He was also the first man to fly an aeroplane built in Britain, on 16 October 1908. A flamboyant showman, he was often confused with Buffalo Bill Cody, whose surname he took when young. Early life Cody's early life is difficult to separate from his own stories told later in life, but he was born Samuel Franklin Cowdery in 1867, in Davenport, Iowa, where he attended school until the age of 12. Not much is known about his life at this time, although he claimed that during his youth he had lived the typical life of a cowboy. He learned how to ride and train horses, shoot and use a lasso. He later claimed to have ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kites 1st Co Signal Corps
A kite is a tethered heavier-than-air or lighter-than-air craft with wing surfaces that react against the air to create lift and drag forces. A kite consists of wings, tethers and anchors. Kites often have a bridle and tail to guide the face of the kite so the wind can lift it. Some kite designs don’t need a bridle; box kites can have a single attachment point. A kite may have fixed or moving anchors that can balance the kite. The name is derived from kite, the hovering bird of prey. The lift that sustains the kite in flight is generated when air moves around the kite's surface, producing low pressure above and high pressure below the wings. The interaction with the wind also generates horizontal drag along the direction of the wind. The resultant force vector from the lift and drag force components is opposed by the tension of one or more of the lines or tethers to which the kite is attached. The anchor point of the kite line may be static or moving (e.g., the towing of a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Percale
Percale is a closely woven plain-weave fabric often used for bed covers. Percale has a thread count of about 200 or higher and is noticeably tighter than the standard type of weave used for bedsheets. It has medium weight, is firm and smooth with no gloss, and warps and washes very well. It is made from both carded and combed yarns, and may be woven of various fibers, such as cotton, polyester, or various blends. History ''Moris'' or ''mauris'' was the 18th century French term used for percale, the cloth imported from India. It was a cotton cloth. Moris was the third most exported fabric from Coromandel Coast after Longcloth and Salampore. It was superior and finer quality than the peers. Coromandel coastline forms a part of Tamil Nadu and Andhra Pradesh. Moris was produced at Nellore, Arni, Maduranthakam, and Cuddalore. Palakollu.The cloth was famous as painted chintz in southeast countries also. Percale was formerly imported from India in the 17th and 18th centuries, th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Malay Kite
The Malay kite is a model of tailless kite. First introduced to the West in a New York City newspaper article from October 1894, the Malay kite was used for recreation for centuries before this in parts of the Far East. The article detailed how a university professor ("Clayton") had erected a series of kites and bound them all together to one kite. These kites had no tail, were bowed and diamond-shaped, and were referred to by the article writer as "Malay kites". However, the existence of a Malay-like design may have already been heard of in the United States sometime before the publishing of the article; in the last edition of the ''American Boy's Handy Book'', another tailless kite is described (there referred to as a "Holland" kite). The description of this kite, which was to be included as a chapter in the book, was sent in to the author sometime around 1882, eleven years before the Malay kite was mentioned in the newspaper.Beard, p. 67 Design The Malay is similar in design to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henry Harrison Chase Dunwoody
Henry Harrison Chase Dunwoody (October 23, 1842 – January 1, 1933) was an American army officer, businessman, and inventor. Known in his own time for his work with the Army's Weather Bureau, he invented the carborundum radio detector in 1906. It was the first practical mineral radio wave detector and the first commercial semiconductor device. Army career Henry Harrison Chase Dunwoody was born October 23, 1842, in Highland County, Ohio to William Dunwoody and Sarah Murphy. He entered the United States Military Academy as a cadet September 1, 1862, and was appointed second lieutenant, 4th Artillery after graduating in 1866. He spent much of his career in weather forecasting with the Signal Office, working as chief weather forecaster and creating a system of distributed storm warnings. In 1883 he wrote a book on Weather Proverbs, still an often quoted work on the subject. With the outbreak of the Spanish–American War he organized the Volunteer Signal Corps, serving as Chief ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Washington Navy Yard
The Washington Navy Yard (WNY) is the former shipyard and ordnance plant of the United States Navy in Southeast Washington, D.C. It is the oldest shore establishment of the U.S. Navy. The Yard currently serves as a ceremonial and administrative center for the U.S. Navy, home to the Chief of Naval Operations, and is headquarters for the Naval Sea Systems Command, Naval Reactors, Naval Facilities Engineering Systems Command, Naval History and Heritage Command, the National Museum of the United States Navy, the U.S. Navy Judge Advocate General's Corps, Marine Corps Institute, the United States Navy Band, and other more classified facilities. In 1998, the yard was listed as a Superfund site due to environmental contamination. History The history of the yard can be divided into its military history and cultural and scientific history. Military The land was purchased under an Act of Congress on July 23, 1799. The Washington Navy Yard was established on October 2, 1799, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fort Myer
Fort Myer is the previous name used for a U.S. Army post next to Arlington National Cemetery in Arlington County, Virginia, and across the Potomac River from Washington, D.C. Founded during the American Civil War as Fort Cass and Fort Whipple, the post merged in 2005 with the neighboring Marine Corps installation, Henderson Hall, and is today named Joint Base Myer–Henderson Hall. History In 1861, the land that Fort Myer would eventually occupy was part of the Arlington estate, which Mary Anna Custis Lee, the wife of Robert E. Lee, owned and at which Lee resided when not stationed elsewhere (see Arlington House, The Robert E. Lee Memorial). When the Civil War began, the Commonwealth of Virginia seceded from the United States, Lee resigned his commission, and he and his wife left the estate. The United States Government then confiscated the estate and began to use it as a burial ground for Union Army dead (see Arlington National Cemetery), to house freed slaves (Freedmen's Vill ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetrahedral Kite
A tetrahedral kite is a multicelled rigid box kite composed of tetrahedrally shaped cells to create a kind of tetrahedral truss. The cells are usually arranged in such a way that the entire kite is also a regular tetrahedron. The kite can be described as a compound dihedral kite as well. This kite was invented by Alexander Graham Bell. It came about from his experiments with Hargrave's box kites and his attempts to build a kite that was scalable and big enough to carry both a man and a motor. As such, it was an early experiment on the road to manned flight. He worked on the kites between 1895 and 1910. Bell wrote about his discovery of this concept in the June 1903 issue of ''National Geographic'' magazine; the article was titled "Tetrahedral Principle in Kite Structure". From an initial one-cell model, Bell advanced to a 3,393-cell " Cygnet" model in 1907. This 40-foot-long (12.2 m), 200-pound (91 kilogram) kite was towed by a steamer offshore near Baddeck, Nova Scotia, on Dec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lee De Forest
Lee de Forest (August 26, 1873 – June 30, 1961) was an American inventor and a fundamentally important early pioneer in electronics. He invented the first electronic device for controlling current flow; the three-element "Audion" triode vacuum tube in 1906. This started the Electronic Age, and enabled the development of the electronic amplifier and oscillator. These made radio broadcasting and long distance telephone lines possible, and led to the development of talking motion pictures, among countless other applications. He had over 300 patents worldwide, but also a tumultuous career— he boasted that he made, then lost, four fortunes. He was also involved in several major patent lawsuits, spent a substantial part of his income on legal bills, and was even tried (and acquitted) for mail fraud. Despite this, he was recognised for his pioneering work with the 1922 IEEE Medal of Honor, the 1923 Franklin Institute Elliott Cresson Medal and the 1946 American Institute of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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