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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 Rueben 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hannibal, Missouri
Hannibal is a city along the Mississippi River in Marion County, Missouri, Marion and Ralls County, Missouri, Ralls counties in the U.S. state of Missouri. According to the 2020 United States census, 2020 U.S. Census, the population was 17,108, 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. Nestled on the Mississippi River, commerce and traffic has long been an integral part of Hannibal's development, including by river, rail and the interstate/highway system. Today the city is intersected by Interstate 72 and U.S. Routes U.S. Route 24 in Missouri, 24, U.S. Route 36 in Missouri, 36, and U.S. Route 61 in Missouri, 61. Hannibal is approximately northwest of St. Louis, Missouri, St. Louis (also bordering the Mississippi), east-northeast of Kansas City, Missouri, Kansas City and miles east of Saint Joseph, Missouri, Saint Joseph (both cities on the Missouri River), and approximate ... [...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. By 1947, it was the largest book publisher in the United States. 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 Alfred A. Knopf, Knopf Publishing Group to form the Knopf Doubleday Publishing Group, which, as of 2018, is part of Penguin Random House. History 19th century 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. Somerset Maugham and Joseph Conrad. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miniaturization
Miniaturization ( Br.Eng.: ''miniaturisation'') is the trend to manufacture ever-smaller mechanical, optical, and electronic products and devices. Examples include miniaturization of mobile phones, computers and vehicle engine downsizing. In electronics, the exponential scaling and miniaturization of silicon MOSFETs (MOS transistors) leads to the number of transistors on an integrated circuit chip doubling every two years, an observation known as Moore's law. This leads to MOS integrated circuits such as microprocessors and memory chips being built with increasing transistor density, faster performance, and lower power consumption, enabling the miniaturization of electronic devices. Electronic circuits The history of miniaturization is associated with the history of information technology based on the succession of switching devices, each smaller, faster, and cheaper than its predecessor. During the period referred to as the Second Industrial Revolution (), miniaturizati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnavox
Magnavox (Latin for "great voice", often stylized as MAGNAVOX) is an American electronics brand. It was purchased by North American Philips in 1974, which was absorbed into Dutch electronics company Philips in 1987. 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 Magnavox Odyssey, Odyssey, the world's first home video game console. On January 29, 2013, it was announced that Philips had agreed to sell its audio and video operations to the Japan-based Funai, 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 transaction, Funai was to pay a regular licensing fee to Philips f ... [...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 maybe 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 vol ... [...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 Bertra ... [...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 process is known as ''rectification'', since it "straightens" the direction of current. Physically, rectifiers take a number of forms, including Vacuum tube#Diodes, vacuum tube diodes, wet chemical cells, mercury-arc valves, stacks of copper and selenium rectifier, selenium oxide plates, Diode#Semiconductor diodes, 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 "Crystal detector#Cat whisker detector, 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 component ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quincy, Illinois
Quincy ( ) is a city in Adams County, Illinois, United States, and its county seat. Located on the Mississippi River, the population was 39,463 as of the 2020 United States census, 2020 census, down from 40,633 in 2010. The Quincy, Illinois, micropolitan area, Quincy micropolitan area had 114,649 residents. Known as Illinois's "Gem City", Quincy was a thriving transportation center as riverboats and rail service linked the city to many destinations west and along the river during the 19th century. It was Illinois' second-largest city, surpassing Peoria, Illinois, 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 New France, French became the first European presence to colonize t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Morse Code
Morse code is a telecommunications method which Character encoding, encodes Written language, 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 early developers of the system adopted for electrical telegraphy. International Morse code encodes the 26 ISO basic Latin alphabet, basic Latin letters to , one Diacritic, accented Latin letter (), the Arabic numerals, and a small set of punctuation and procedural signals (Prosigns for Morse code, 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 can vary for signal clarity and operator skill, but for any one message, once the rhythm is established, a beat (music), half-beat is the basic unit of time measurement in Morse code. The duration of a ''dah'' is three times the duration ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wireless
Wireless communication (or just wireless, when the context allows) is the transfer of information (''telecommunication'') between two or more points without the use of an electrical conductor, optical fiber or other continuous guided transmission medium, 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 NASA Deep Space Network, deep-space radio communications. It encompasses various types of fixed, mobile, and portable applications, including two-way radios, Mobile phone, cellular telephones, personal digital assistants (PDAs), and wireless networking. Other examples of applications of radio ''wireless technology'' include Global Positioning System, GPS units, garage door openers, wireless Mouse (computing), computer mouse, Keyboard (computing), keyboards and Headset (audio), headsets, headphones, radio receivers, satelli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Autodidact
Autodidacticism (also autodidactism) or self-education (also self-learning, self-study and self-teaching) is the practice of education without the guidance of schoolmasters (i.e., teachers, professors, institutions). Overview Autodidacts are ''self-taught'' humans who learn a subject-of-study's aboutness through self-study. This educative praxis (process) may involve, complement, or be an alternative to formal education. Formal education itself may have a hidden curriculum that requires self-study for the uninitiated. 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. The self-learning curriculum is infinite. One may seek out alternative pathways in education and use these to gain compet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
