|
16-50 Mark 7
The 16"/50 caliber Mark 7 – United States Naval Gun is the main armament of the ''Iowa''-class battleships and was the planned main armament of the canceled . Description Due to a lack of communication during design in 1938, the Bureau of Ordnance assumed the ''Iowa'' class would use the /50 Mark 2 guns constructed for the 1920 ''South Dakota''-class battleships and ''Lexington''-class battlecruisers. However, the Bureau of Construction and Repair assumed that the ships would carry a compact 16-in/50 turret and designed the ships with barbettes too small to accommodate the 16-in/50 Mark 2 three-gun turret that the Bureau of Ordnance was actually working on. The lightweight 16-in/50 Mark 7 was designed to resolve this conflict. These guns were 50 calibers long, 50 times their bore diameter with barrels long, from chamber to muzzle. Each gun weighed about without the breech, and with the breech. They fired projectiles weighing from at different muzzle velociti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Broadside (naval)
A broadside is the side of a ship, or more specifically the artillery battery, battery of cannon on one side of a warship or their coordinated fire in naval warfare, or a measurement of a warship's maximum simultaneous firepower which can be delivered upon a single target (because this concentration is usually obtained by firing a broadside). From the 16th century until the early decades of the steamship, vessels had rows of guns set in each side of the hull (watercraft), hull. Firing all guns on one side of the ship became known as a "broadside". The cannon of 18th-century man-of-war, men of war were accurate only at short range, and their penetrating power mediocre, which meant that the thick hulls of wooden ships could only be pierced at short ranges. These wooden ships sailed closer and closer towards each other until cannon fire would be effective. Each tried to be the first to fire a broadside, often giving one party a decisive headstart in the battle when it crippled the oth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barbette
Barbettes are several types of gun emplacement in terrestrial fortifications or on naval ships. In recent naval usage, a barbette is a protective circular armour support for a heavy gun turret. This evolved from earlier forms of gun protection that eventually led to the pre-dreadnought. The name ''barbette'' ultimately comes from fortification: it originally meant a raised platform or mound, as in the French phrase ''en barbette'', which refers to the practice of firing a cannon over a parapet rather than through an embrasure in a fortification's casemate. The former gives better angles of fire but less protection than the latter. The disappearing gun was a variation on the barbette gun; it consisted of a heavy gun on a carriage that would retract behind a parapet or into a gunpit for reloading. Barbettes were primarily used in coastal defences, but saw some use in a handful of warships, and some inland fortifications. The term is also used for certain aircraft gun mounts. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Japanese Battleship Yamato
was the lead ship of her class of battleships built for the Imperial Japanese Navy (IJN) shortly before World War II. She and her sister ship, , were the heaviest and most powerfully armed battleships ever constructed, displacing nearly at full load and armed with nine Type 94 main guns, which were the largest guns ever mounted on a warship. ''Yamato'' was designed to counter the numerically superior battleship fleet of the United States, Japan's main rival in the Pacific. She was laid down in 1937 and formally commissioned a week after the attack on Pearl Harbor in December 1941. Throughout 1942, she served as the flagship of the Combined Fleet, and in June 1942 Admiral Isoroku Yamamoto directed the fleet from her bridge during the Battle of Midway, a disastrous defeat for Japan. ''Musashi'' took over as the Combined Fleet flagship in early 1943, and ''Yamato'' spent the rest of the year moving between the major Japanese naval bases of Truk and Kure in response to Am ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IEEE Annals Of The History Of Computing
The ''IEEE Annals of the History of Computing'' is a quarterly peer-reviewed academic journal published by the IEEE Computer Society. It covers the history of computing, computer science, and computer hardware. It was founded in 1979 by the American Federation of Information Processing Societies. The journal publishes scholarly articles, interviews, "think pieces", and memoirs by computer pioneers, and news and events in the field. It was established in July 1979 as ''Annals of the History of Computing'', with Bernard Galler as editor-in-chief. The journal became an IEEE publication in 1992, and was retitled to ''IEEE Annals of the History of Computing''. The 2020 impact factor was 0.741. The current editor in chief is Troy Astarte at Swansea University in Wales. See also * ''Technology and Culture'' * '' Information & Culture'' * Computer History Museum * Charles Babbage Institute The IT History Society (ITHS) is an organization that supports the history and scholarship o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radar
Radar is a system that uses radio waves to determine the distance ('' ranging''), direction ( azimuth and elevation angles), and radial velocity of objects relative to the site. It is a radiodetermination method used to detect and track aircraft, ships, spacecraft, guided missiles, motor vehicles, map weather formations, and terrain. The term ''RADAR'' was coined in 1940 by the United States Navy as an acronym for "radio detection and ranging". The term ''radar'' has since entered English and other languages as an anacronym, a common noun, losing all capitalization. A radar system consists of a transmitter producing electromagnetic waves in the radio or microwave domain, a transmitting antenna, a receiving antenna (often the same antenna is used for transmitting and receiving) and a receiver and processor to determine properties of the objects. Radio waves (pulsed or continuous) from the transmitter reflect off the objects and return to the receiver, giving ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rangekeeper
Rangekeepers were electromechanical fire control computers used primarily during the early part of the 20th century. They were sophisticated analog computers whose development reached its zenith following World War II, specifically the Computer Mk 47 in the Mk 68 Gun Fire Control system. During World War II, rangekeepers directed gunfire on land, sea, and in the air. While rangekeepers were widely deployed, the most sophisticated rangekeepers were mounted on warships to direct the fire of long-range guns.Technically, it would be more accurate to use the term "rifle" for long-range ship-board cannon. However, the term "gun" is commonly used and that nomenclature is maintained here. These warship-based computing devices needed to be sophisticated because the problem of calculating gun angles in a naval engagement is very complex. In a naval engagement, both the ship firing the gun and the target are moving with respect to each other. In addition, the ship firing its gun is not a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beam (nautical)
The beam of a ship is its width at its widest point. The maximum beam (BMAX) is the distance between planes passing through the outer sides of the ship, beam of the hull (BH) only includes permanently fixed parts of the hull, and beam at waterline (BWL) is the maximum width where the hull intersects the surface of the water. Generally speaking, the wider the beam of a ship (or boat), the more initial stability it has, at the expense of secondary stability in the event of a capsize, where more energy is required to right the vessel from its inverted position. A ship that heels on her ''beam ends'' has her deck beams nearly vertical. Typical values Typical length-to-beam ratios ( aspect ratios) for small sailboats are from 2:1 (dinghies to trailerable sailboats around ) to 5:1 (racing sailboats over ). Large ships have widely varying beam ratios, some as large as 20:1. Rowing shells designed for flatwater racing may have length to beam ratios as high as 30:1, while a cora ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Insider Inc
Insider Inc. (formerly Business Insider Inc.) is an American online media company known for publishing ''Business Insider'' and other media websites. It is a subsidiary of the German publisher Axel Springer SE, the largest in Europe. History ''Business Insider'' was founded in 2007 by Henry Blodget and Kevin P. Ryan. In 2013, Jeff Bezos led an effort to raise million for Business Insider Inc. through his investment company Bezos Expeditions. On September 29, 2015, Axel Springer SE announced that it had acquired 88% of the stake in Business Insider Inc. for a reported million ( million). After the purchase, Axel Springer SE held a stake of approximately 97%, and Jeff Bezos held the remaining shares through Bezos Expeditions. Business Insider Inc.'s name was changed to Insider Inc. in December 2017 as the company planned on becoming a general interest news publisher. Nicholas Carlson is Global Editor-in-Chief of Insider. In January 2018, the firm moved its global headquarter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
James G
James may refer to: People * James (given name) * James (surname) * James (musician), aka Faruq Mahfuz Anam James, (born 1964), Bollywood musician * James, brother of Jesus * King James (other), various kings named James * Prince James (other) * Saint James (other) Places Canada * James Bay, a large body of water * James, Ontario United Kingdom * James College, a college of the University of York United States * James, Georgia, an unincorporated community * James, Iowa, an unincorporated community * James City, North Carolina * James City County, Virginia ** James City (Virginia Company) ** James City Shire * James City, Pennsylvania * St. James City, Florida Film and television * ''James'' (2005 film), a Bollywood film * ''James'' (2008 film), an Irish short film * ''James'' (2022 film), an Indian Kannada-language film * "James", a television episode of ''Adventure Time'' Music * James (band), a band from Manchester ** ''James'', U ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Simon & Schuster
Simon & Schuster LLC (, ) is an American publishing house owned by Kohlberg Kravis Roberts since 2023. It was founded in New York City in 1924, by Richard L. Simon and M. Lincoln Schuster. Along with Penguin Random House, Hachette Book Group USA, Hachette, HarperCollins and Macmillan Publishers, Simon & Schuster is considered one of the Big Five (publishers), 'Big Five' English language publishers. , Simon & Schuster was the third largest publisher in the United States, publishing 2,000 titles annually under 35 different Imprint (trade name), imprints. History Early years In 1924, Richard L. Simon, Richard Simon's aunt, a crossword puzzle enthusiast, asked whether there was a book of ''New York World'' crossword puzzles, which were popular at the time. After discovering that none had been published, Simon and M. Lincoln Schuster, Max Schuster decided to launch a company to exploit the opportunity.Frederick Lewis Allen, ''Only Yesterday: An Informal History of the 1920s'', p. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Evan Thomas
Evan Welling Thomas III (born April 25, 1951) is an American journalist, historian, lawyer, and author. He is the author of 11 books, including two ''New York Times'' bestsellers. Early life and career Thomas was born in Huntington, New York, and raised in nearby Cold Spring Harbor. A graduate of Phillips Academy, Harvard University (B.A.), and the University of Virginia School of Law ( J.D.), from 1991 he was a reporter, writer, and editor at ''Newsweek'' for 24 years. Prior to that, he was at ''Time''.Thomas began his reporting career at '' The Bergen Record'' in northeastern New Jersey. In 1992, DCI Robert Gates granted Thomas historical access to view classified Central Intelligence Agency files. The fundamental authority for this policy is Executive Order 12356 (April 1982), as implemented in HR 10–24(c)4. Under these provisions, CIA may grant individual researchers and former presidential appointees access to classified files, once the recipient of this access signs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Analog Computer
An analog computer or analogue computer is a type of computation machine (computer) that uses physical phenomena such as Electrical network, electrical, Mechanics, mechanical, or Hydraulics, hydraulic quantities behaving according to the mathematical principles in question (''analog signals'') to Scientific modelling, model the problem being solved. In contrast, digital computers represent varying quantities symbolically and by discrete values of both time and amplitude (digital signals). Analog computers can have a very wide range of complexity. Slide rules and nomograms are the simplest, while naval gunfire control computers and large hybrid digital/analog computers were among the most complicated. Complex mechanisms for process control and protective relays used analog computation to perform control and protective functions. Analog computers were widely used in scientific and industrial applications even after the advent of digital computers, because at the time they were ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
