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	Wikinfo \| Telescope (Site not responding. Last check: 2007-10-10)
		Telescopes used for non-astronomical purposes may be referred to as "transits," "monoculars," "binoculars," "camera lenses," or "spyglasses".
		The 0.91m Yerkes Telescope (in Wisconsin) is the largest aimable refractor in use.
		The telescope was aimed by by the aid of a Foucault sidérostat, which is a movable plane mirror of diameter 6.56 feet, mounted in a large cast-iron frame.
	www.wikinfo.org /wiki.php?title=telescope (939 words)

	Yerkes Observatory - Wikipedia, the free encyclopedia
		The Yerkes Observatory is an astronomical observatory of the University of Chicago in Williams Bay, Wisconsin.
		A 102 cm (40 inch) refracting telescope built by the master optician Alvan Clark is located inside; it was the largest telescope in the world until the construction of Mount Wilson's reflector.
		Yerkes Observatory is the setting for a portion of the 1996 movie Chain Reaction[4] including gunplay, airboat chases across frozen Lake Geneva, and a character who, when first seen, is making naked-eye observations through eyepiece of the forty-inch refractor.
	en.wikipedia.org /wiki/Yerkes_Observatory (572 words)

	Telescope: World of Earth Science
		Telescope sights on top of mountains are popular because the light reaching the instrument has to travel through less air, and consequently the image has a higher resolution.
		Another advantage of using a telescope in orbit is that the telescope can detect wavelengths such as the ultraviolet and various portions of the infrared, which are absorbed by the atmosphere and not detectable by ground-based telescopes.
		Infrared telescopes (operating from 1–1000 æm) are particularly useful for examining the emissions from gas clouds.
	science.enotes.com /earth-science/telescope (2419 words)

	Yerkes Observatory: A century of stellar science
		Although the low-altitude observatory and great refracting telescope have long been surpassed by mountain-top observatories with ever-larger reflecting telescopes, Yerkes is one of the "grand dames" of modern astronomy.
		Yerkes Observatory owes its beginnings to its wealthy patron, Charles Tyson Yerkes; a visionary University of Chicago president, William Rainey Harper; and an ambitious young astronomer, George Ellery Hale.
		Yerkes Observatory, 1892-1950: The Birth, Near Death and Resurrection of a Scientific Research Institution, is published by the University of Chicago Press.
	chronicle.uchicago.edu /970320/yerkes.shtml (1671 words)

	National Park Service: Astronomy and Astrophysics (Yerkes Observatory)
		Yerkes Observatory is the observing facility of the Department of Astronomy and Astrophysics of the University of Chicago and is devoted to research in astronomy and astrophysics, as well as graduate education.
		Yerkes represented the wave of the future and established the modern observatory as a research institution where the astronomer, using the disciplines of chemistry and physics, supported by engineering and optics workshops, could apply his talents to the understanding of the wonders of the universe.
		The establishment of Yerkes Observatory near the city of Chicago was the joint idea of astronomer George Ellery Hale and William Harper, president of the University of Chicago.
	www.cr.nps.gov /history/online_books/butowsky5/astro4p.htm (2554 words)

	The Scoundrel and the Scientist
		Hale fitted a photographic plate across the eyepiece of a telescope with a clockwork device to move the apparatus at the same pace that the sun crosses the sky.
		Yerkes wrote back, ordering that no one but those supervising the installation and testing be allowed near the telescope.
		The forty-inch telescope is still the largest refractor in the world, and the Yerkes Observatory is still the primary observatory of the Department of Astronomy and Astrophysics at the University of Chicago.
	www.sff.net /people/Hodgson/science.html (3877 words)

	Bill Keel's Telescope Tourism - Yerkes Observatory (Site not responding. Last check: 2007-10-10)
		The 40-inch refractor was one of several "world's largest telescopes" successively produced by George Ellery Hale, passing through the 60- and 100-inch reflectors on Mt.
		The Yerkes telescope remains the largest refractor ever put into astronomical use (this weasel wording comes about because there was once a 1.2-m or 48-inch horizontal telescope displayed in Paris, but no results came from it).
		It once housed the 24-inch Ritchey reflector used by Hubble in his dissertation studies of nebulae; I last saw that telescope in the Smithsonian Institution in Washington.
	www.astr.ua.edu /keel/telescopes/yerkes.html (175 words)

	Lake County Astronomical Society NightTimes
		Several telescope makers had achieved renown for the quality of their instruments -- they included the famous names of Clark, Brashear, and Mogey. Most major discoveries before the 20th century were made using refractors.
		The telescope would not fit under a conventional observatory dome and after the year-long exposition was over, its builders were unable to sell it to any institution.
		Yerkes was the last major observatory to be constructed near sea level.
	www.bpccs.com /lcas/Articles/telehist.htm (1819 words)

	Stargazer Online \|\| Yerkes Observatory
		The crown jewel of the observatory is the 40" telescope, which today remains the largest refractor in the world.
		The telescope itself was assembled by the manufacturing firm Warner and Swasey.
		They were also responsible for the construction of the telescope mount, 90' diameter dome to house the telescope, and a 73' diameter elevating floor that lifts astronomers to the telescope eyepiece.
	www.richardbell.net /yerkes.html (988 words)

	Astrotale - How do you talk a reluctant railroad tycoon into building the largest refracting telescope?
		Yerkes was a crass and vainglorious businessman trying to buy his way into high society through philanthropy.
		Yerkes saw a huge telescope and and impressive dome with his name on it.
		George Ellery Hale was very pleased with the excellent work that made the Yerkes Observatory the premier astronomical complex in the early part of the 20th century.
	www.wpo.net /astrotales/yerkes.html (401 words)

	Save Yerkes Observatory - World's Largest Refracting Telescope (Site not responding. Last check: 2007-10-10)
		Since its founding over a century ago, Yerkes Observatory has never failed to spark the imaginations of all--whether scientist or tourist, architect or amateur astronomer--who have come here to be a part of its history.
		In its most recent past, scientists at Yerkes have produced extraordinary feats of engineering, such as developing instruments which have helped scientists record some of the most remarkable sightings in the history of astrophysics--such as fragments from the Comet Shoemaker-Levy colliding with the planet Jupiter.
		The Yerkes 21 Committee, as well as scientists, politicians, students, and citizens from both near and far, believe that this legendary observatory--this historic Mecca--and the land which encompasses it would prove to be a great loss not only for the community of Williams Bay, but the international community of astronomers and astrophysicists...
	www.specializedwholesale.com /grantsstuff/atthelake/index.html (1104 words)

	GCSE Astronomy - Observatories
		The Yerkes Telescope on Williams Bay in Wisconsin, completed in 1897, is the world's largest refractor, with an objective of 101cm.
		Whereas the 5 meter Palomar Telescope is the largest reflector with a single mirror, the Keck is effectively a reflector with a 10 meter mirror, although this 'mirror' is made of 36 separate hexagonal segments, aligned by computers.
		The telescope is a 2.4 meter reflector and it orbits at a height of around 600 km.
	members.tripod.com /~BDaugherty/gcseAstronomy/observatories.html (345 words)

	Mount Wilson Observatory
		In order to move the telescope smoothly during long exposures and to accurately point it to almost any part of the sky, a new system had to be developed to maneuver the 22 tons of moving parts.
		It was the first major telescope to use a coudé focus, by which light could be sent to a very large spectrograph that was not attached to the telescope.
		The success of the telescope was not dimmed by discovery of a periodic error in its tracking, but extra care was necessary to keep the object centered in the telescope during an exposure.
	www.mtwilson.edu /his/art/g1a3.php (2407 words)

	Save Yerkes Observatory - World's Largest Refracting Telescope
		Yerkes is a 100-year-old observatory located in Williams Bay, Wisconsin.
		Yerkes occupies a place of great significance as a world leader in 20 century astro-physics, a place of reverence and respect, where Einstein visited, where Chandrasekhar did his work on fl holes that led to his Nobel Prize.
		Yerkes 21 Corporation is a not-for-profit corporation registered with the State of Wisconsin.
	www.saveyerkes.com (643 words)

	[No title]
		Yerkes was built by George Ellery Hale, a visionary astronomer and son of a wealthy Chicago elevator industrialist.
		The Yerkes telescope was the titan of its age, a widely acclaimed engineering wonder that astronomers hoped would revolutionize their science.
		Gee also hopes that Yerkes could be granted landmark status, something it does not have in order to have the freedom to modify the building for scientific reasons.
	www.grantmaclaren.com /yerkes/yerkes2/index.html (1590 words)

	Telescopes and Optics
		As long as the telescope and the platform on which the observer stands move as a unit, there is no relative motion of the eyepiece and the observer as the telescope slews or tracks objects.
		The magnification of a telescope is the focal length of the scope divided by focal length of the eyepiece.
		Since magnification is the focal length of the telescope divided by the focal length of the eyepiece, increasing the telescope's focal length has the effect of increasing the magnification by the same factor.
	www.frostydrew.org /observatory/courses/scopes/booklet.htm (13602 words)

	Charles Yerkes, telescope benefactor, a stellar scoundrel, author says
		Even by Chicago's standards at the turn of the 19th century, "streetcar magnate" Charles Tyson Yerkes was an outlaw, a scoundrel who never met a rule, regulation or obstacle he couldn't march over, under, around or through.
		Yerkes (1837-1905), a man Franch variously calls "the magnate" and "the financier," won and lost vast sums of money as a broker and later a pioneer in public mass-transit, but like the proverbial cat, he somehow managed to land on his — or someone else's — feet.
		Yerkes also financed the building of a magnificent fountain in Lincoln Park, donated animals to a local zoo and loaned paintings and sculpture to the Art Institute of Chicago.
	www.eurekalert.org /pub_releases/2006-07/uoia-cyt072506.php (964 words)

	OnMilwaukee.com Dining: Historic Yerkes Observatory offers a look at history, stars
		Yerkes Observatory was the pet project of Charles Tyson Yerkes, a Chicago transportation bigwig.
		The centerpiece of the building was, as it still is, the 40-inch refractor telescope, which is now, as it was then, the world's largest.
		In the southeast transept, on the main floor, is the Quester Museum, which celebrates Yerkes astronomers who have profoundly impacted the scientific world and the local community over the past 100 years.
	www.onmilwaukee.com /articles/yerkes.html (673 words)

	The 40-inch.
		In 1890, this telescope was already partially under construction, and it was planned to be the world's largest telescope.
		It was, in fact, the world's largest telescope from 1897 (when it was commissioned) to 1909, and it is still the world's largest refractor.
		This is necessary because the telescope pivots about the middle of the telescope tube: if one end points to a star low on the horizon, the other end (through which you want to look) will be far off the ground.
	astro.uchicago.edu /vtour/40inch (612 words)

	Yerkes Observatory Virtual Tour Intro Page (Site not responding. Last check: 2007-10-10)
		Yerkes is a 100-year-old observatory (owned by the University of Chicago) with five research telescopes, one of which is the largest refractor in the world.
		First, we should define the difference between a reflecting and a refracting telescope, since that is information we will use a LOT on this tour.
		Snapshot of Science at Yerkes, including photos of the labs and instruments in use.
	astro.uchicago.edu /vtour (299 words)

	Yerkes Observatory introduces blind students to universe (Site not responding. Last check: 2007-10-10)
		Now the University’s Yerkes Observatory in Williams Bay, Wisc., and DePaul University’s Space Science Center for Education and Outreach are similarly opening the world of astronomy to blind students at the Wisconsin Center for the Blind and Visually Impaired through the Space Exploration Experience project.
		The collaboration includes the Wisconsin Center for the Blind and Visually Impaired in Janesville, the Colorado School for the Blind in Colorado Springs, and the Charles Hayden Planetarium of the Museum of Science in Boston.
		It is necessary to put an infrared telescope on an airplane because the Earth’s atmosphere prevents most infrared light from reaching the ground.
	chronicle.uchicago.edu /030925/yerkes.shtml (519 words)

	Charles Yerkes, telescope benefactor, a stellar scoundrel, author says
		Just how hard they had to work – on both sides of the law – to hold on to their empires is revealed in a new book about one particularly ingenious and controversial tycoon.
		Franch, a freelance writer and an archivist at the University Library of the University of Illinois at Urbana-Champaign, traces the roller-coaster ride of the “traction king” through newspapers, memoirs, credit reports, court filings and bankruptcy records.
		Charles Yerkes' paramour, Emilie Grigsby, was 19 or 20 years younger, but his equal in sophistication, charm and intelligence.
	www.news.uiuc.edu /news/06/0725yerkes.html (1094 words)

	The Dream City: The Great Yerkes Telescope (Site not responding. Last check: 2007-10-10)
		By means of the two axles on which the main cylinder was pivoted, the instrument could be pointed toward any star in the hemisphere, and at many times visitors were able to behold the operator putting the telescope through all its motions.
		After the Fair it was dismounted, and on the night of January 8, 1894, while the Manufactures Buildings was on fire, President Harper, of the University near by, secured aid enough to carry the tube out of the threatened structure.
		Charles T. Yerkes, the cable-car magnate, gave the University authority to make the largest telescope in the world at his expense, and it is said $500,000 was expended.
	columbus.gl.iit.edu /dreamcity/00034096.html (240 words)

	Some Giant Telescopes — Infoplease.com
		The telescope's primary mirror measures 21.3 ft (6.5 m) in diameter.
		The Magellan I (2000) and Magellan II (2002) twin telescopes at the Las Campanas Observatory in the Chilean Andes.
		Mid-Infrared spectrophotometric calibration for the new generation of large telescopes: A solution to the problem of calibrating data......
	www.infoplease.com /ipa/A0004510.html (476 words)

	JS Online:
		After more than a century of service to science, Yerkes Observatory, home to the world's largest refracting telescope, is for sale.
		Yerkes Observatory on Geneva Lake in Williams Bay houses the world's largest refracting telescope.
		Kyle Cudworth, staff astronomer at Yerkes, has used the observatory's 40-inch refractor to determine the motion of stars within globular clusters, comparing modern pictures with those taken decades ago.
	www.jsonline.com /alive/news/jan05/297579.asp (1664 words)

	SS Cygni.... Cataclysmic Variable Star in Cygnus
		Images of SS Cyg with the Yerkes 24 inch telescope have a five arc minute field of view.
		HOU-ELM 10 inch Yerkes rooftop telescope with an ST 9 CCD, about a quarter degree field of view.
		HOU 8 inch Yerkes rooftop telescope with an ST 7 CCD, about a half degree field of view.
	hou.lbl.gov /~vhoette/Explorations/SSCyg (1055 words)

	Jupiter Week - Hands-On Universe
		Student Nikki visited Yerkes to take images of Io as it reached Eastern elongation on March 29th, 2005.
		HOU Students and Teachers around the world watch Join us to share your observations; download images contributed by various observers; and discover for yourself all you can learn about Jupiter and its moons in the process.
		This telescope can be operated remotely over the Internet by HOU teachers and their students.
	hou.lbl.gov /~vhoette/Explorations/JupiterWeek/index.html (316 words)

	Forty-inch telescope, Yerkes Observatory (Site not responding. Last check: 2007-10-10)
		Four inches wider than the Lick telescope on Mt. Hamilton in California, the light-gathering capabilities of the Yerkes instrument allowed Hale and his colleagues to see farther and in greater detail than anyone ever had before.
		Hale attached his newly designed Rumford spectroheliograph to the telescope and used it to investigate the sun's internal characteristics.
		Hale was also the first to photograph low temperature red stars known as Secchi's fourth type.
	www.lib.uchicago.edu /e/spcl/centcat/fac/fac_img11.html (71 words)

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