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McMillin Observatory
McMillin Observatory was an astronomical observatory built around 1895 on the campus of Ohio State University. Named after Emerson McMillin and operated by the university, the observatory closed in 1968 and its telescope later moved to Ballreich Observatory. The observatory was equipped with photographic cameras, a filar micrometer, and a custom Brashear spectroscope. The observatory had two main focuses, education and at least one astronomic scientific research study focus. History The director of the observatory was Professor Henry C. Lord. The observatory was equipped with a 12.5 inch aperture refractor, the largest telescope in Ohio, USA on its debut in 1896. It was on a Warner and Swasey mounting and Brashear made the optics. An 1896 document about the observatory said the Warner and Swasey mount was so well known it did no need description. The observatory was formally opened on June 16, 1896. The building included the one foot refractor, a laboratory, and a planetarium. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
McMillin Observatory Taken Spring Of 1971
McMillin is a surname. Notable people with the surname include: *Benton McMillin (1845–1943), Governor of Tennessee *Bo McMillin (1895–1952), American football coach *Challace McMillin (1942–2020), American football coach at James Madison University *Corky McMillin (1929–2005), American racer * David McMillin (born 1984), American singer *George McMillin (1889–1983), 38th and final Naval Governor of Guam * James McMillin (1914–2005), American Olympic rower *John Ernest McMillin (1884–1949), member of Canadian House of Commons * John S. McMillin (1855–1936), American lawyer and businessman * Judson McMillin (born 1977), member of the Indiana House of Representatives See also *Crocker-McMillin Mansion-Immaculate Conception Seminary, National Register of Historic Places site in New Jersey * McMillin Bridge, bridge in Washington state *McMillin Observatory McMillin Observatory was an astronomical observatory built around 1895 on the campus of Ohio State University. N ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astronomy
Astronomy () is a natural science that studies astronomical object, celestial objects and phenomena. It uses mathematics, physics, and chemistry in order to explain their origin and chronology of the Universe, evolution. Objects of interest include planets, natural satellite, moons, stars, nebulae, galaxy, galaxies, and comets. Relevant phenomena include supernova explosions, gamma ray bursts, quasars, blazars, pulsars, and cosmic microwave background radiation. More generally, astronomy studies everything that originates beyond atmosphere of Earth, Earth's atmosphere. Cosmology is a branch of astronomy that studies the universe as a whole. Astronomy is one of the oldest natural sciences. The early civilizations in recorded history made methodical observations of the night sky. These include the Babylonian astronomy, Babylonians, Greek astronomy, Greeks, Indian astronomy, Indians, Egyptian astronomy, Egyptians, Chinese astronomy, Chinese, Maya civilization, Maya, and many anc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Observatory
An observatory is a location used for observing terrestrial, marine, or celestial events. Astronomy, climatology/meteorology, geophysical, oceanography and volcanology are examples of disciplines for which observatories have been constructed. Historically, observatories were as simple as containing an astronomical sextant (for measuring the distance between stars) or Stonehenge (which has some alignments on astronomical phenomena). Astronomical observatories Astronomical observatories are mainly divided into four categories: space-based, airborne, ground-based, and underground-based. Ground-based observatories Ground-based observatories, located on the surface of Earth, are used to make observations in the radio and visible light portions of the electromagnetic spectrum. Most optical telescopes are housed within a dome or similar structure, to protect the delicate instruments from the elements. Telescope domes have a slit or other opening in the roof that can be opened during ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ohio State University
The Ohio State University, commonly called Ohio State or OSU, is a public land-grant research university in Columbus, Ohio. A member of the University System of Ohio, it has been ranked by major institutional rankings among the best public universities in the United States. Founded in 1870 as the state's land-grant university and the ninth university in Ohio with the Morrill Act of 1862, Ohio State was originally known as the Ohio Agricultural and Mechanical College and focused on various agricultural and mechanical disciplines, but it developed into a comprehensive university under the direction of then-Governor and later U.S. president Rutherford B. Hayes, and in 1878, the Ohio General Assembly passed a law changing the name to "the Ohio State University" and broadening the scope of the university. Admission standards tightened and became greatly more selective throughout the 2000s and 2010s. Ohio State's political science department and faculty have greatly contri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emerson McMillin
Emerson McMillin (April 16, 1844 - May 30, 1922) was an American financier and banker. The head of the banking house of Emerson McMillin, McMillin won a commission through "gallant conduct under fire" fighting for the Union Army in the Civil War, before moving to the Ohio Valley to work in the iron works and steel industries. He founded American Light and Traction in 1900 and became president. Early life He was born on April 16, 1844, in Ewington, Ohio. His family was of Scottish heritage, and had initially settled in Virginia. He was the twelfth of fourteen children, and went to school several months a year until the age of ten. His father was the manager of an iron furnace and Emerson worked as an iron furnace apprentice for four years starting at age 12, in 1856. He acquired a good education with hard study after-hours, with a particular interest in scientific research. The ''Times'' wrote that he "made a practice of thoroughly examining the application of the scientific pri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Filar Micrometer
A filar micrometer is a specialized eyepiece used in astronomical telescopes for astrometry measurements, in microscopes for specimen measurements, and in alignment and surveying telescopes for measuring angles and distances on nearby objects. The word ''filar'' derives . It refers to the fine threads or wires used in the device. Construction and use A typical filar micrometer consists of a reticle that has two fine parallel wires or threads that can be moved by the observer using a micrometer screw mechanism. The wires are placed in the focal image plane of the eyepiece so they remain sharply superimposed over the object under observation, while the micrometer motion moves the wires across the focal plane. Other designs employ a fixed reticle, against which one wire or a second reticle moves. By rotating the eyepiece assembly in the eyetube, the measurement axis can be aligned to match the orientation of the two points of observation. At one time, it was common to use s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Optical Spectrometer
An optical spectrometer (spectrophotometer, spectrograph or spectroscope) is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum, typically used in spectroscopic analysis to identify materials. The variable measured is most often the light's Intensity (physics), intensity but could also, for instance, be the Polarization (waves), polarization state. The independent variable is usually the wavelength of the light or a unit directly proportional to the photon energy, such as Wavenumber, reciprocal centimeters or electron volts, which has a reciprocal relationship to wavelength. A spectrometer is used in spectroscopy for producing spectral lines and measuring their wavelengths and intensities. Spectrometers may operate over a wide range of non-optical wavelengths, from gamma rays and X-rays into the far infrared. If the instrument is designed to measure the spectrum on an absolute scale rather than a relative one, then it is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heidelberg University (Ohio)
Heidelberg University is a private university in Tiffin, Ohio. Founded in 1850, it was known as Heidelberg College until 1889 and from 1926 to 2009. It is affiliated with the United Church of Christ. History Heidelberg University was founded by the German Reformed Church as a college in 1850 in Ohio. It is affiliated with the United Church of Christ, the successor to that denomination. In the mid-nineteenth century, there were a significant number of German immigrants in Ohio. The German Reformed Church had seventy-four churches in the state when members decided to establish the college. The college had five students enrolled in the first classes. By the end of the year, 149 students were enrolled. Transition On the morning of October 25, 2008 the Heidelberg College Board of Trustees unanimously agreed to transition to Heidelberg University. The name change went into effect at the beginning of the 2009–2010 academic year. According to a statement issued by former interim P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Halley's Comet
Halley's Comet or Comet Halley, officially designated 1P/Halley, is a short-period comet visible from Earth every 75–79 years. Halley is the only known short-period comet that is regularly visible to the naked eye from Earth, and thus the only naked-eye comet that can appear twice in a human lifetime. Halley last appeared in the inner parts of the Solar System in 1986 and will next appear in mid-2061. Halley's periodic returns to the inner Solar System have been observed and recorded by astronomers around the world since at least 240 BC. But it was not until 1705 that the English astronomer Edmond Halley understood that these appearances were reappearances of the same comet. As a result of this discovery, the comet is named after Halley. During its 1986 visit to the inner Solar System, Halley's Comet became the first comet to be observed in detail by spacecraft, providing the first observational data on the structure of a comet nucleus and the mechanism of coma and tail f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Largest Optical Telescopes Of The 19th Century
List of largest optical telescopes in the 19th century, are listings of what were, for the time period of the 19th century large optical telescopes. See List of largest optical telescopes in the 20th century for the 1900s. The list includes various refractor and reflector that were active some time between about 1799 to 1901. The main reflecting technology early on, speculum metal reflected some 2/3 of light, and also had higher maintenance due to tarnishing. Another technology were the 2-element refractors, which were extensively used in 19th century observatories despite their small apertures compared to the largest metal mirror, and later glass telescopes. The technology for silver-coated glass mirrors was developed in the mid-19th century, but was slow to catch on. A major technology advance of this time was the development of astrophotography, and some telescopes were tailored to this application. Also, a wide variety of scientific instruments were developed, such as for spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Largest Optical Refracting Telescopes
Refracting telescopes use a lens to focus light. The largest refracting telescope in the world is the Yerkes Observatory 40 inch (102 cm) refractor, used for astronomical and scientific observation for over a century. The Swedish 1-m Solar Telescope, which has an actual lens diameter of 43 inches, is technically then larger than the lens of the Yerkes, but only 39 inches are clear for the aperture, and is used today for solar observations .The next largest refractor telescopes are the James Lick telescope, and the Meudon Great Refractor. Most are classical great refractors, which used achromatic doublets on an equatorial mount. However, other large refractors include a 21st-century solar telescope which is not directly comparable because it uses a single element non-achromatic lens, and the short-lived Great Paris Exhibition Telescope of 1900. It used a 78-inch (200 cm) Focault siderostat for aiming light into the Image-forming optical system part of the telescope, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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