Charles R. Cross (physicist)
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Charles R. Cross (physicist)
Charles Robert Cross (March 29, 1848 – November 16, 1921) was an American physicist and chair of the physics department at the Massachusetts Institute of Technology from 1877 to 1917. Biography Cross was born March 29, 1848, in Troy, New York to George Cross and Lucy Ann Brown. When he was 14, his family moved to Newburyport, Massachusetts where he attended the Putnam Free School, graduating in 1865. He entered the Massachusetts Institute of Technology as a sophomore in 1867 and graduated in 1870 with a Bachelor of Science. Following graduation, he became instructor in physics, assistant professor in 1871, and full professor in 1875. Cross became chair of the MIT physics department in 1877, after the resignation of Edward Charles Pickering, Edward Pickering. In 1882, Cross developed and taught the first course in electrical engineering in the country. He instructed on telegraphy, telephony, and Dynamo, dynamo electric machinery. He taught this course until 1902, when he estab ...
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Troy, New York
Troy is a city in and the county seat of Rensselaer County, New York, United States. It is located on the western edge of the county, on the eastern bank of the Hudson River just northeast of the capital city of Albany, New York, Albany. At the 2020 United States census, 2020 census, the population of Troy was 51,401. Troy has close ties to Albany and nearby Schenectady, New York, Schenectady, forming a region called the Capital District (New York), Capital District, which has a population of 1.24 million. The area long had been occupied by the Mohican Indian tribe, but Dutch settlement began in the mid-17th century. The Dutch colony was conquered by the English in 1664, renamed Troy in 1789 and was incorporated as a Town (New York), town in 1791. Due to the confluence of major waterways and a geography that supported water power, the American Industrial Revolution took hold in this area, making Troy reputedly the fourth-wealthiest city in America around the turn of the 20th cent ...
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Telephony
Telephony ( ) is the field of technology involving the development, application, and deployment of telecommunications services for the purpose of electronic transmission of voice, fax, or data, between distant parties. The history of telephony is intimately linked to the invention and development of the telephone. Telephony is commonly referred to as the construction or operation of telephones and telephonic systems and as a system of telecommunications in which telephonic equipment is employed in the transmission of speech or other sound between points, with or without the use of wires. The term is also used frequently to refer to computer hardware, software, and computer network systems, that perform functions traditionally performed by telephone equipment. In this context the technology is specifically referred to as Internet telephony, or voice over Internet Protocol (VoIP). Overview The first telephones were connected directly in pairs: each user had a separate telephone wire ...
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American Institute Of Electrical Engineers
The American Institute of Electrical Engineers (AIEE) was a United States–based organization of electrical engineers that existed from 1884 through 1962. On January 1, 1963, it merged with the Institute of Radio Engineers (IRE) to form the Institute of Electrical and Electronics Engineers (IEEE). History The 1884 founders of the American Institute of Electrical Engineers (AIEE) included some of the most prominent inventors and innovators in the then new field of electrical engineering, among them Nikola Tesla, Thomas Alva Edison, Elihu Thomson, Edwin J. Houston, and Edward Weston. The purpose of the AIEE was stated "to promote the Arts and Sciences connected with the production and utilization of electricity and the welfare of those employed in these Industries: by means of social intercourse, the reading and discussion of professional papers and the circulation by means of publication among members and associates of information thus obtained." The first president of AIE ...
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Société Française De Physique
The Société Française de Physique (SFP), or the French Physical Society, is the main professional society of French physicists. It was founded in 1873 by Joseph-Charles d'Almeida. History The French Physical Society is a state-approved non-profit scientific society aiming to promote the knowledge of physics. Its member include physicists living in France, regardless of background. As well as promoting physics, the SFP also acts as a lobbying organization with French policymakers alongside other scientific societies, the like the French Academy of Sciences, French Society of Mathematicians, and Union of Physicists. The SFP organizes a large number of events (conferences, workshops, exhibitions, etc.) for academic and general audiences. The SFP edits the ''Bulletin Newsletters'' and the review ''Reflets de la Physique''. Each year, the SFP awards several prizes to physicists in honor of specific works or actions towards the promotion of physics outside the community. The ...
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American Physical Society
The American Physical Society (APS) is a not-for-profit membership organization of professionals in physics and related disciplines, comprising nearly fifty divisions, sections, and other units. Its mission is the advancement and diffusion of knowledge of physics. It publishes more than a dozen scientific journals, including the prestigious '' Physical Review'' and ''Physical Review Letters'', and organizes more than twenty science meetings each year. It is a member society of the American Institute of Physics. Since January 2021, it is led by chief executive officer Jonathan Bagger. History The American Physical Society was founded on May 20, 1899, when thirty-six physicists gathered at Columbia University for that purpose. They proclaimed the mission of the new Society to be "to advance and diffuse the knowledge of physics", and in one way or another the APS has been at that task ever since. In the early years, virtually the sole activity of the APS was to hold scientific m ...
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American Academy Of Arts And Sciences
The American Academy of Arts and Sciences (The Academy) is one of the oldest learned societies in the United States. It was founded in 1780 during the American Revolution by John Adams, John Hancock, James Bowdoin, Andrew Oliver, and other Founding Fathers of the United States. It is headquartered in Cambridge, Massachusetts. Membership in the academy is achieved through a nominating petition, review, and election process. The academy's quarterly journal, '' Dædalus'', is published by the MIT Press on behalf of the academy, and has been open-access since January 2021. The academy also conducts multidisciplinary public policy research. Laurie L. Patton has served as President of the Academy since January 2025. History The Academy was established by the Massachusetts legislature on May 4, 1780, charted in order "to cultivate every art and science which may tend to advance the interest, honor, dignity, and happiness of a free, independent, and virtuous people." The sixty-tw ...
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British Association For The Advancement Of Science
The British Science Association (BSA) is a Charitable organization, charity and learned society founded in 1831 to aid in the promotion and development of science. Until 2009 it was known as the British Association for the Advancement of Science (BA). The current Chief Executive is Hannah Russell. The BSA's mission is to get more people engaged in the field of science by coordinating, delivering, and overseeing different projects that are suited to achieve these goals. The BSA "envisions a society in which a diverse group of people can learn and apply the sciences in which they learn." and is managed by a professional staff located at their Head Office in the Wellcome Wolfson Building. The BSA offers a wide variety of activities and events that both recognise and encourage people to be involved in science. These include the British Science Festival, British Science Week, the CREST Awards, For Thought, The Ideas Fund, along with regional and local events. History Foundation Th ...
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American Association For The Advancement Of Science
The American Association for the Advancement of Science (AAAS) is a United States–based international nonprofit with the stated mission of promoting cooperation among scientists, defending scientific freedom, encouraging scientific responsibility, and supporting science education, scientific education and science outreach for the betterment of all humanity. AAAS was the first permanent organization established to promote science and engineering nationally and to represent the interests of American researchers from across all scientific fields. It is the world's largest general scientific society, with over 120,000 members, and is the publisher of the well-known scientific journal ''Science (journal), Science''. History Creation The American Association for the Advancement of Science was created on September 20, 1848, at the Academy of Natural Sciences in Philadelphia, Pennsylvania. It was a reformation of the Association of American Geologists and Naturalists with the broaden ...
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Lowell Institute
The Lowell Institute is a United States educational foundation located in Boston, Massachusetts, providing both free public lectures, and also advanced lectures. It was endowed by a bequest of $250,000 left by John Lowell Jr., who died in 1836. The Institute began work in the winter of 1839/40, and an inaugural lecture was given on December 31, 1839, by Edward Everett. Bequest Lowell's will set up an endowment with a principal of over $1 million (in 1909), stipulating 10% of its net annual income was to be added back to help it grow. None of the fund was to be invested in a building for the lectures. The trustees of the Boston Athenaeum were made visitors of the fund, but the trustee of the fund is authorized to select his own successor. In naming a successor, the institute's trustee must always choose in preference to all others some male descendant of Lowell's grandfather, John Lowell, provided there is one who is competent to hold the office of trustee, and of the name of L ...
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Polarization (waves)
, or , is a property of transverse waves which specifies the geometrical orientation of the oscillations. In a transverse wave, the direction of the oscillation is perpendicular to the direction of motion of the wave. One example of a polarized transverse wave is vibrations traveling along a taut string, for example, in a musical instrument like a guitar string. Depending on how the string is plucked, the vibrations can be in a vertical direction, horizontal direction, or at any angle perpendicular to the string. In contrast, in longitudinal waves, such as sound waves in a liquid or gas, the displacement of the particles in the oscillation is always in the direction of propagation, so these waves do not exhibit polarization. Transverse waves that exhibit polarization include electromagnetic waves such as light and radio waves, gravitational waves, and transverse sound waves ( shear waves) in solids. An electromagnetic wave such as light consists of a coupled oscillating el ...
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Radioactive Decay
Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered ''radioactive''. Three of the most common types of decay are Alpha decay, alpha, Beta decay, beta, and Gamma ray, gamma decay. The weak force is the Fundamental interactions, mechanism that is responsible for beta decay, while the other two are governed by the electromagnetic force, electromagnetic and nuclear forces. Radioactive decay is a randomness, random process at the level of single atoms. According to quantum mechanics, quantum theory, it is impossible to predict when a particular atom will decay, regardless of how long the atom has existed. However, for a significant number of identical atoms, the overall decay rate can be expressed as a decay constant or as a half-life. The half-lives of radioactive atoms have a huge range: f ...
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Wireless Telegraphy
Wireless telegraphy or radiotelegraphy is the transmission of text messages by radio waves, analogous to electrical telegraphy using electrical cable, cables. Before about 1910, the term ''wireless telegraphy'' was also used for other experimental technologies for transmitting telegraph signals without wires. In radiotelegraphy, information is transmitted by pulses of radio waves of two different lengths called "dots" and "dashes", which spell out text messages, usually in Morse code. In a manual system, the sending operator taps on a switch called a telegraph key which turns the transmitter on and off, producing the pulses of radio waves. At the radio receiver, receiver the pulses are audible in the receiver's speaker as beeps, which are translated back to text by an operator who knows Morse code. Radiotelegraphy was the first means of radio communication. The first practical radio transmitters and radio receiver, receivers invented in 1894–1895 by Guglielmo Marconi used radi ...
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