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Harry Shoemaker
Harry Shoemaker (May 11, 1879 – August 8, 1932) was an American inventor and pioneer radio engineer, who received more than 40 U.S. patents in the radio field from 1901 to 1905. His transmitter and receiver designs set the standard for the U. S. commercial radio industry up to World War One. Early life Shoemaker was born in 1879 near Millville, Pennsylvania. His early education was at the Greenwood Seminary in Millville, Pennsylvania and the Normal School in Muncy, Pennsylvania. In 1896, he began attending Pennsylvania State College. In 1894, Professor Henry Russell conducted a classroom demonstration of the transmission and reception of electromagnetic radiation (radio signals). A fascinated Shoemaker conducted further experiments at his home, using a spark-gap transmitter, plus a coherer receiver of his own design, which used a galvanometer's needle to strike and reset the coherer after each received Morse code signal. However, he did not publicize or patent any of his early ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Indian reservations. The United States is also in free association with three Pacific Island sovereign states: the Federated States of Micronesia, the Marshall Islands, and the Republic of Palau. It is the world's third-largest country by both land and total area. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 million, it is the most populous country in the Americas and the third most populous in the world. The national capital of the United States is Washington, D.C. and its most populous city and principal financial center is New York City. Paleo-Americ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Louisiana Purchase Exposition
The Louisiana Purchase Exposition, informally known as the St. Louis World's Fair, was an World's fair, international exposition held in St. Louis, Missouri, United States, from April 30 to December 1, 1904. Local, state, and federal funds totaling $15 million were used to finance the event. More than 60 countries and 43 of the then-45 American states maintained exhibition spaces at the fair, which was attended by nearly 19.7 million people. Historians generally emphasize the prominence of the themes of Race (human categorization), race and imperialism, and the fair's long-lasting impact on intellectuals in the fields of history, art history, architecture and anthropology. From the point of view of the memory of the average person who attended the fair, it primarily promoted entertainment, consumer goods and popular culture. The monumental Greco-Roman architecture of this and other fairs of the era did much to influence permanent new buildings and master plans of major cities. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Inventors
American(s) may refer to: * American, something of, from, or related to the United States of America, commonly known as the "United States" or "America" ** Americans, citizens and nationals of the United States of America ** American ancestry, people who self-identify their ancestry as "American" ** American English, the set of varieties of the English language native to the United States ** Native Americans in the United States, indigenous peoples of the United States * American, something of, from, or related to the Americas, also known as "America" ** Indigenous peoples of the Americas * American (word), for analysis and history of the meanings in various contexts Organizations * American Airlines, U.S.-based airline headquartered in Fort Worth, Texas * American Athletic Conference, an American college athletic conference * American Recordings (record label), a record label previously known as Def American * American University, in Washington, D.C. Sports teams Soccer * B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Duracell Battery
Duracell Inc. is an American manufacturer of alkaline batteries, specialty cells, rechargeables and smart power systems, owned by Berkshire Hathaway. The company has its origins in the 1920s, through the work of Samuel Ruben and Philip Mallory, and the formation of the P. R. Mallory Company. Through a number of corporate mergers and acquisitions, Duracell came to be owned by the consumer products conglomerate Procter & Gamble (P&G). In November 2014, P&G reached an agreement to sell the company to Berkshire Hathaway through a transfer of shares. Under the deal, Berkshire Hathaway exchanged the shares it held in P&G for ownership of the Duracell business. History Origins Duracell originated via the partnership of scientist Samuel Ruben and businessman Philip Rogers Mallory, who met during the 1920s. The P. R. Mallory Company of Burlington, Massachusetts, United States, relocated its headquarters to Indianapolis, Indiana, in 1924. The company produced mercury batteries f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Samuel Ruben
Samuel Ruben (14 July 1900 – 16 July 1988) was an American inventor who made lasting contributions to electrochemistry and solid-state technology, including the founding of Duracell. He is listed as an inventor in ove200 patents. Early life Born to a Jewish family, Samuel Ruben got his start in electronics when he became a licensed ham radio operator and built radios with spare parts. He had no college degree, withdrawing from the Polytechnic Institute of Brooklyn after a few years due to stress. Samuel Ruben met professor Bergen Davis of Columbia University who tutored him and allowed him to sit in on some Columbia classes. He later returned as a research student at the Polytechnic Institute of Brooklyn. Ruben received several honorary degrees. He was awarded an honorary Doctor of Science degree from his alma mater Polytechnic Institute of Brooklyn, as well as from Columbia University in the Department of Chemical Engineering and Applied Science where he served as a Senior Staff ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marconi Wireless Telegraph Company Of America
The Marconi Wireless Telegraph Company of America (commonly called American Marconi) was incorporated in 1899. It was established as a subsidiary of the British Marconi Company and held the U.S. and Cuban rights to Guglielmo Marconi's radio (then called "wireless telegraphy") patents. American Marconi initially primarily operated high-powered land and transatlantic shipboard stations. In 1912, it acquired the extensive assets of the bankrupt United Wireless Telegraph Company, becoming the dominant radio communications provider in the United States. During World War One the United States government assumed control of the radio industry. After the war government officials balked at returning the American Marconi stations to the original owners, distrusting British control of radio communication due to national security concerns. Led by the U.S. Navy, the government pressured the Marconi companies to transfer American Marconi to a U.S. owner. The American Marconi assets were purchase ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Institute Of Radio Engineers
The Institute of Radio Engineers (IRE) was a professional organization which existed from 1912 until December 31, 1962. On January 1, 1963, it merged with the American Institute of Electrical Engineers (AIEE) to form the Institute of Electrical and Electronics Engineers (IEEE). Founding Following several attempts to form a technical organization of wireless practitioners in 1908–1912, the Institute of Radio Engineers (IRE) was finally established in 1912 in New York City. Among its founding organizations were the Society of Wireless Telegraph Engineers (SWTE) and the Wireless Institute (TWI). At the time, the dominant organization of electrical engineers was the American Institute of Electrical Engineers (AIEE). Many of the founding members of IRE considered AIEE too conservative and too focused on electric power. Moreover, the founders of the IRE sought to establish an international organization (unlike the “American” AIEE), and adopted a tradition of electing some of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United Wireless Telegraph Company
The United Wireless Telegraph Company was the largest radio communications firm in the United States, from its late-1906 formation until its bankruptcy and takeover by Marconi interests in mid-1912. At the time of its demise, the company was operating around 70 land and 400 shipboard radiotelegraph installations — by far the most in the U.S. However, the firm's management had been substantially more interested in fraudulent stock promotion schemes than in ongoing operations or technical development. United Wireless' shutdown, following federal mail fraud prosecution, was hailed for eliminating one of the largest financial frauds of the period. However, its disappearance also left the U.S. radio industry largely under foreign influence, dominated by the British-controlled Marconi Wireless Telegraph Company of America (American Marconi). Formation United Wireless' establishment was announced with great fanfare in November 1906 by its founder and first president, stock promoter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leyden Jar
A Leyden jar (or Leiden jar, or archaically, sometimes Kleistian jar) is an electrical component that stores a high-voltage electric charge (from an external source) between electrical conductors on the inside and outside of a glass jar. It typically consists of a glass jar with metal foil cemented to the inside and the outside surfaces, and a metal terminal projecting vertically through the jar lid to make contact with the inner foil. It was the original form of capacitor (also called a ''condenser''). Its invention was a discovery made independently by German cleric Ewald Georg von Kleist on 11 October 1745 and by Dutch scientist Pieter van Musschenbroek of Leiden (Leyden), Netherlands in 1745–1746. The Leyden jar was used to conduct many early experiments in electricity, and its discovery was of fundamental importance in the study of electrostatics. It was the first means of accumulating and preserving electric charge in large quantities that could be discharged at the exp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pennsylvania State University
The Pennsylvania State University (Penn State or PSU) is a Public university, public Commonwealth System of Higher Education, state-related Land-grant university, land-grant research university with campuses and facilities throughout Pennsylvania. Founded in 1855 as the Farmers' High School of Pennsylvania, Penn State became the state's only Land-grant university, land-grant university in 1863. Today, Penn State is a major research university which conducts teaching, research, and public service. Its instructional mission includes undergraduate, graduate, professional and continuing education offered through resident instruction and online delivery. The University Park campus has been labeled one of the "Public Ivy, Public Ivies", a publicly funded university considered as providing a quality of education comparable to those of the Ivy League. In addition to its land-grant designation, it also participates in the sea-grant, space-grant, and sun-grant research consortia; it is on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archie Frederick Collins
Archie Frederick Collins (January 8, 1869 – January 3, 1952), who generally went by A. Frederick Collins, was a prominent early American experimenter in wireless telephony and prolific author of books and articles covering a wide range of scientific and technical subjects. His reputation was tarnished in 1913 when he was convicted of mail fraud related to stock promotion. However, after serving a year in prison, he returned to writing, including, beginning in 1922, ''The Radio Amateur's Handbook'', which continued to be updated and published until the mid-1980s. Early life Collins was born in South Bend, Indiana, to Captain Thomas Jefferson and Margaret Ann (Roller) Collins. He attended public schools and graduated from the Old University of Chicago, a Baptist school which preceded the present University of Chicago. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amos Dolbear
Amos Emerson Dolbear (November 10, 1837 – February 23, 1910) 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. Biography Amos Dolbear was born in Norwich, Connecticut on November 10, 1837. He was a graduate of Ohio Wesleyan University, in Delaware, Ohio. While a student there, he had made a "talking telegraph" and invented a receiver containing two features of the modern telephone: a permanent magnet and a metallic diaphragm that he made from a tintype. He invented the fi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
