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Bill Lear
William Powell Lear (June 26, 1902 – May 14, 1978) was an American inventor and businessman. He is best known for founding Learjet, a manufacturer of business jets. He also invented the battery eliminator for the B battery, and developed the car radio and the 8-track cartridge, an audio tape system.Stim and Pressman 2007, p. 20. Throughout his career of 46 years, Lear received over 140 patents. Career Lear was born on June 26, 1902, in Hannibal, Missouri to Ruben Marion Lear, a carpenter, and Gertrude Elizabeth Powell Lear. His mother left his father and he stayed with his aunt, Gussie Bornhouser, in Dubuque, Iowa. Later, Otto Kirmse took him in and raised him as his stepson. The family relocated to Chicago where Lear attended Kershaw Grammar School. On Sundays, he attended the Moody Tabernacle (now Moody Church). "From listening to Paul Rader, of the Moody Tabernacle, he learned grammar and how to speak. He found out how to meet people, how to shake hands, and what to sa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hannibal, Missouri
Hannibal is a city along the Mississippi River in Marion and Ralls counties in the U.S. state of Missouri. According to the 2020 U.S. Census, the population was 17,312, making it the largest city in Marion County. The bulk of the city is in Marion County, with a tiny sliver in the south extending into Ralls County. Developed for river traffic, today the city is tied to vehicle traffic, intersected by Interstate 72 and U.S. Routes 24, 36, and 61. It is across the river from East Hannibal, Illinois. Hannibal is approximately northwest of St. Louis (also bordering the Mississippi), east-northeast of Kansas City and miles east of Saint Joseph (both cities on the Missouri River), and approximately west of Springfield, Illinois. Hannibal is not the county seat, but it has one of two county courthouses. There is also one in Palmyra, the county seat, which is located more centrally in the county. Hannibal is the principal city of the Hannibal, Missouri micropolitan area, w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Doubleday (publisher)
Doubleday is an American publishing company. It was founded as the Doubleday & McClure Company in 1897 and was the largest in the United States by 1947. It published the work of mostly U.S. authors under a number of imprints and distributed them through its own stores. In 2009 Doubleday merged with Knopf Publishing Group to form the Knopf Doubleday Publishing Group, which is now part of Penguin Random House. In 2019, the official website presents Doubleday as an imprint, not a publisher. History The firm was founded as Doubleday & McClure Company in 1897 by Frank Nelson Doubleday in partnership with Samuel Sidney McClure. McClure had founded the first U.S. newspaper syndicate in 1884 ( McClure Syndicate) and the monthly '' McClure's Magazine'' in 1893. One of their first bestsellers was ''The Day's Work'' by Rudyard Kipling, a short story collection that Macmillan published in Britain late in 1898. Other authors published by the company in its early years include W. Somerse ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnavox
Magnavox (Latin for "great voice", stylized as MAGNAVOX) is an American electronics company that since 1974 has been a subsidiary of the Dutch electronics corporation Philips. The predecessor to Magnavox was founded in 1911 by Edwin Pridham and Peter L. Jensen, co-inventors of the moving-coil loudspeaker at their lab in Napa, California, under United States Patent number 1,105,924 for telephone receivers.Kornum, Rene.The loudspeaker is 100 years old '' Ingeniøren'', 4 November 2015 Six decades later, Magnavox produced the Odyssey, the world's first home video game console. Magnavox is the brand name worn by a line of products now made by Funai under license from trademark owner Philips. However, on 29 January 2013, it was announced that Philips had agreed to sell its audio and video operations to the Japan-based Funai Electric for €150 million, with the audio business planned to transfer to Funai in the latter half of 2013, and the video business in 2017. As part of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Power Inverter
A power inverter, inverter or invertor is a power electronic device or circuitry that changes direct current (DC) to alternating current (AC). The resulting AC frequency obtained depends on the particular device employed. Inverters do the opposite of rectifiers which were originally large electromechanical devices converting AC to DC. The input voltage, output voltage and frequency, and overall power handling depend on the design of the specific device or circuitry. The inverter does not produce any power; the power is provided by the DC source. A power inverter can be entirely electronic or may be a combination of mechanical effects (such as a rotary apparatus) and electronic circuitry. Static inverters do not use moving parts in the conversion process. Power inverters are primarily used in electrical power applications where high currents and voltages are present; circuits that perform the same function for electronic signals, which usually have very low currents and vo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grigsby-Grunow-Hinds
Majestic Radios was an American radio brand from 1927 to 1955, trademarked as "The Mighty Monarchs of the Air". Noted for their high quality, they were initially manufactured by the Grigsby-Grunow Company of Chicago. After Grigsby-Grunow's demise in 1934 during the Great Depression, Majestic Radios continued to be made through subsequent corporate ownership changes and reorganizations for another twenty-two years. The Majestic Radio & Television Corporation was formed to produce the radios in the 1930s and 1940s. Following Majestic Radio & Television's liquidation in 1949, Majestic-brand radios were made by a division of the Wilcox-Gay Corporation at their Michigan factory in the 1950s. Grigsby-Grunow years (1927–1934) Formation and development Before embarking on radio manufacturing, the Grigsby-Grunow Company had started in 1921 as the Grigsby-Grunow-Hinds Company in Chicago, making such automotive aftermarket items as its "Premier" brand of sun visors. co-founded by Be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rectifier
A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The reverse operation (converting DC to AC) is performed by an inverter. The process is known as ''rectification'', since it "straightens" the direction of current. Physically, rectifiers take a number of forms, including vacuum tube diodes, wet chemical cells, mercury-arc valves, stacks of copper and selenium oxide plates, semiconductor diodes, silicon-controlled rectifiers and other silicon-based semiconductor switches. Historically, even synchronous electromechanical switches and motor-generator sets have been used. Early radio receivers, called crystal radios, used a " cat's whisker" of fine wire pressing on a crystal of galena (lead sulfide) to serve as a point-contact rectifier or "crystal detector". Rectifiers have many uses, but are often found serving as components of DC power supplies ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ohm's Law
Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Introducing the constant of proportionality, the resistance, one arrives at the usual mathematical equation that describes this relationship: :I = \frac, where is the current through the conductor, ''V'' is the voltage measured ''across'' the conductor and ''R'' is the resistance of the conductor. More specifically, Ohm's law states that the ''R'' in this relation is constant, independent of the current. If the resistance is not constant, the previous equation cannot be called ''Ohm's law'', but it can still be used as a definition of static/DC resistance. Ohm's law is an empirical relation which accurately describes the conductivity of the vast majority of electrically conductive materials over many orders of magnitude of current. However some materials do not obey Ohm's law; these are called non-ohmic. The law was named after ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quincy, Illinois
Quincy ( ), known as Illinois's "Gem City", is a city in and the county seat of Adams County, Illinois, United States, located on the Mississippi River. The 2020 census counted a population of 39,463 in the city itself, down from 40,633 in 2010. As of July 1, 2015, the Quincy Micro Area had an estimated population of 77,220. During the 19th century, Quincy was a thriving transportation center as riverboats and rail service linked the city to many destinations west and along the river. It was Illinois' second-largest city, surpassing Peoria in 1870. The city has several historic districts, including the Downtown Quincy Historic District and the South Side German Historic District, which display the architecture of Quincy's many German immigrants from the late 19th century. History Early history Quincy's location along the Mississippi River has attracted settlers for centuries. The French became the first European presence to colonize the region, after Louis Jolliet, Jacques ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Morse Code
Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called ''dots'' and ''dashes'', or ''dits'' and ''dahs''. Morse code is named after Samuel Morse, one of the inventors of the telegraph. International Morse code encodes the 26 basic Latin letters through , one accented Latin letter (), the Arabic numerals, and a small set of punctuation and procedural signals ( prosigns). There is no distinction between upper and lower case letters. Each Morse code symbol is formed by a sequence of ''dits'' and ''dahs''. The ''dit'' duration is the basic unit of time measurement in Morse code transmission. The duration of a ''dah'' is three times the duration of a ''dit''. Each ''dit'' or ''dah'' within an encoded character is followed by a period of signal absence, called a ''space'', equal to the ''dit'' duration. The letters of a word are separated by a space of duration equal to three ''dits' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wireless
Wireless communication (or just wireless, when the context allows) is the transfer of information between two or more points without the use of an electrical conductor, optical fiber or other continuous guided medium for the transfer. The most common wireless technologies use radio waves. With radio waves, intended distances can be short, such as a few meters for Bluetooth or as far as millions of kilometers for deep-space radio communications. It encompasses various types of fixed, mobile, and portable applications, including two-way radios, cellular telephones, personal digital assistants (PDAs), and wireless networking. Other examples of applications of radio ''wireless technology'' include GPS units, garage door openers, wireless computer mouse, keyboards and headsets, headphones, radio receivers, satellite television, broadcast television and cordless telephones. Somewhat less common methods of achieving wireless communications involve other electromagnetic phen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Autodidact
Autodidacticism (also autodidactism) or self-education (also self-learning and self-teaching) is education without the guidance of masters (such as teachers and professors) or institutions (such as schools). Generally, autodidacts are individuals who choose the subject they will study, their studying material, and the studying rhythm and time. Autodidacts may or may not have formal education, and their study may be either a complement or an alternative to formal education. Many notable contributions have been made by autodidacts. Etymology The term has its roots in the Ancient Greek words (, ) and (, ). The related term '' didacticism'' defines an artistic philosophy of education. Terminology Various terms are used to describe self-education. One such is heutagogy, coined in 2000 by Stewart Hase and Chris Kenyon of Southern Cross University in Australia; others are ''self-directed learning'' and ''self-determined learning''. In the heutagogy paradigm, a learner should ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
