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Henry Augustus Rowland
Henry Augustus Rowland (November 27, 1848 – April 16, 1901) was an American physicist and Johns Hopkins educator. Between 1899 and 1901 he served as the first president of the American Physical Society. He is remembered for the high quality of the diffraction gratings he made and for the work he did with them on the solar spectrum. Early life, family and education Rowland was born in Honesdale, Pennsylvania, where his father Henry Augustus Rowland was a Presbyterian pastor. From an early age, the younger Rowland exhibited marked scientific tastes and spent his spare time in electrical and chemical experiments. He graduated from Rensselaer Polytechnic Institute in Troy, New York in 1870. Career After college, Rowland worked for the Western New York railway, but he did not like the work. He became an instructor in natural science at the University of Wooster in Wooster, Ohio. He resigned in order to return to Troy as assistant professor of physics at Rensselaer. Ro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Honesdale, Pennsylvania
Honesdale is a Local government in Pennsylvania#Borough, borough in, and the county seat of, Wayne County, Pennsylvania, United States. The borough's population was 4,458 at the time of the 2020 United States census, 2020 census. Honesdale is located northeast of Scranton, Pennsylvania, Scranton in a rural area that provides many recreational opportunities, such as boating, fishing, hiking, hunting, skiing, biking, skateboarding, and rafting. Located in a coal mining region, during the nineteenth century it was the starting point of the Delaware and Hudson Canal, which provided for transport of coal to Kingston, New York, and then down the Hudson River to New York City. In the 19th century, the expansion of railroads eventually superseded regular use of the canal. History The discovery of anthracite coal in northeastern Pennsylvania in the early 1800s and the need to transport this valuable fuel to New York City gave birth to the Delaware and Hudson Canal, the American Railroad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rowland Ring
Rowland's ring (aka Rowland ring) is an experimental arrangement for the measurement of the hysteresis curve of a sample of magnetic material. It was developed by Henry Augustus Rowland. The geometry of a Rowland's ring is usually a toroid of magnetic material around which is closely wound a magnetization coil consisting of a large number of windings to magnetize the material, and a sampling coil consisting of a smaller number of windings to sample the induced magnetic flux. The electric current flowing in the magnetization coil dictates the magnetic field intensity \mathbf in the material. The sampling coil produces a voltage proportional to the rate of change of the magnetic field \mathbf in the material. By measuring the time integral of the voltage in the sampling coil versus the current in the magnetization coil, one obtains the hysteresis curve. See also *Electromagnetic induction Electromagnetic or magnetic induction is the production of an electromotive force, elect ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Philosophical Magazine
The ''Philosophical Magazine'' is one of the oldest scientific journals published in English. It was established by Alexander Tilloch in 1798;John Burnett"Tilloch, Alexander (1759–1825)" Dictionary of National Biography#Oxford Dictionary of National Biography, Oxford Dictionary of National Biography, Oxford University Press, Sept 2004; online edn, May 2006, accessed 17 Feb 2010 in 1822 Richard Taylor (editor), Richard Taylor became joint editor and it has been published continuously by Taylor & Francis ever since. Early history The name of the journal dates from a period when "natural philosophy" embraced all aspects of science. The very first paper published in the journal carried the title "Account of Mr Cartwright's Patent Steam Engine". Other articles in the first volume include "Methods of discovering whether Wine has been adulterated with any Metals prejudicial to Health" and "Description of the Apparatus used by Lavoisier to produce Water from its component Parts, Oxyg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
James Clerk Maxwell
James Clerk Maxwell (13 June 1831 – 5 November 1879) was a Scottish physicist and mathematician who was responsible for the classical theory of electromagnetic radiation, which was the first theory to describe electricity, magnetism and light as different manifestations of the same phenomenon. Maxwell's equations for electromagnetism achieved the Unification (physics)#Unification of magnetism, electricity, light and related radiation, second great unification in physics, where Unification (physics)#Unification of gravity and astronomy, the first one had been realised by Isaac Newton. Maxwell was also key in the creation of statistical mechanics. With the publication of "A Dynamical Theory of the Electromagnetic Field" in 1865, Maxwell demonstrated that electric force, electric and magnetic fields travel through space as waves moving at the speed of light. He proposed that light is an undulation in the same medium that is the cause of electric and magnetic phenomena. (Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wooster, Ohio
Wooster ( ) is a city in Wayne County, Ohio, United States, and its county seat. Located in northeastern Ohio, the city lies approximately south-southwest of Cleveland, southwest of Akron and west of Canton. The population was 27,232 at the 2020 census. It is the largest in Wayne County, and the center of the Wooster micropolitan area. Wooster has the main branch and administrative offices of the Wayne County Public Library, and is home to the private College of Wooster. '' fDi magazine'' ranked Wooster among North America's top 10 micro cities for business friendliness and strategy in 2013. History Wooster was established in 1808 by John Bever, William Henry, and Joseph Larwill and named after David Wooster, a general in the American Revolutionary War. Geography According to the United States Census Bureau, the city has a total area of , of which is land and is water. It lies along Killbuck Creek, a tributary of the Walhonding River. The local bedrock consists of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Presbyterian
Presbyterianism is a historically Reformed Protestant tradition named for its form of church government by representative assemblies of elders, known as "presbyters". Though other Reformed churches are structurally similar, the word ''Presbyterian'' is applied to churches that trace their roots to the Church of Scotland or to English Dissenter groups that were formed during the English Civil War, 1642 to 1651. Presbyterian theology typically emphasises the sovereignty of God, the authority of the Scriptures, and the necessity of grace through faith in Christ. Scotland ensured Presbyterian church government in the 1707 Acts of Union, which created the Kingdom of Great Britain. In fact, most Presbyterians in England have a Scottish connection. The Presbyterian denomination was also taken to North America, Australia, and New Zealand, mostly by Scots and Scots-Irish immigrants. Scotland's Presbyterian denominations hold to the Reformed theology of John Calvin and his ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henry Augustus Rowland (minister)
Henry Augustus Rowland (September 18, 1804September 4, 1859) was an American minister. He was the son of Rev. Henry A. Rowland of Windsor, Connecticut, and was born in that town September 18, 1804; his family was related to the preacher Jonathan Edwards. He graduated from Yale University in 1823. After the completion of a course of theological studies at Andover Theological Seminary in 1827 he was ordained to the ministry, and spent a year at the South as an agent of the American Bible Society. In 1833, he was settled as Pastor of the Presbyterian Church at Fayetteville, North Carolina, from which place he removed after several years, to take charge of the Pearl Street Presbyterian Church, in New York City. From New York he was called to Honesdale, Pennsylvania, where he labored as Pastor ten years. About 1856, he left that place, and became the Pastor of the Park Presbyterian Church in Newark, New Jersey, which station he occupied at the time of his death. Six months previous ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rowland Dividing Engine
Rowland may refer to: Places United States *Rowland Heights, California, an unincorporated community in Los Angeles County *Rowland, Kentucky, an unincorporated community * Rowland Township, Michigan *Rowland, Missouri, an unincorporated community * Rowland Township, North Carolina **Rowland, North Carolina, a town * Rowland, Nevada, a ghost town * Rowland, Oregon, a ghost town Elsewhere *Rowland, Derbyshire, England, a village and civil parish *Rowland (crater), on the Moon People *Rowland (given name), people so named *Rowland (surname), people so named Other *The title character of Childe Rowland, a fairy tale by Joseph Jacobs, based on a Scottish ballad *Rowland Institute for Science, now part of Harvard University *Rowland Theater, Pittsburgh, Pennsylvania, United States See also *Rowland House (other) *Rowland Park (other) *Roland (other) Roland (died 778) was a Frankish military leader in Charlemagne's service, and subject of the epic poem '' T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diffraction Grating
In optics, a diffraction grating is an optical grating with a periodic structure that diffraction, diffracts light, or another type of electromagnetic radiation, into several beams traveling in different directions (i.e., different diffraction angles). The emerging coloration is a form of structural coloration. The directions or diffraction angles of these beams depend on the wave (light) Angle of incidence (optics), incident angle to the diffraction grating, the spacing or periodic distance between adjacent diffracting elements (e.g., parallel slits for a transmission grating) on the grating, and the wavelength of the incident light. The grating acts as a dispersion (optics), dispersive element. Because of this, diffraction gratings are commonly used in monochromators and spectrometers, but other applications are also possible such as optical encoders for high-precision motion control and wavefront measurement. For typical applications, a reflection (optics), reflective grati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Physicist
A physicist is a scientist who specializes in the field of physics, which encompasses the interactions of matter and energy at all length and time scales in the physical universe. Physicists generally are interested in the root or ultimate causes of Phenomenon, phenomena, and usually frame their understanding in mathematical terms. They work across a wide range of Physics#Research fields, research fields, spanning all length scales: from atom, sub-atomic and particle physics, through biological physics, to physical cosmology, cosmological length scales encompassing the universe as a whole. The field generally includes two types of physicists: Experimental physics, experimental physicists who specialize in the observation of natural phenomena and the development and analysis of experiments, and Theoretical physics, theoretical physicists who specialize in mathematical modeling of physical systems to rationalize, explain and predict natural phenomena. Physicists can apply their k ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
