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Type of optical telescope
A refracting telescope (also called a refractor or dioptric telescope) is a type of optical telescope that uses a lens as its objective to form an image
Refracting_telescope
invention soon spread across Europe. The design of these early refracting telescopes consisted of a convex objective lens and a concave eyepiece. Galileo
History_of_the_telescope
Instrument that makes distant objects appear magnified
reflecting telescope, which uses mirrors to collect and focus light, was invented within a few decades of the first refracting telescope. In the 20th
Telescope
the aperture. The second largest refracting telescope in the world is the Yerkes Observatory 40 inch (102 cm) refractor, used for astronomical and scientific
List of largest optical refracting telescopes
List_of_largest_optical_refracting_telescopes
Telescope for observations with visible light
types of optical telescope : Refracting telescopes, which use lenses and less commonly also prisms (dioptrics) Reflecting telescopes, which use mirrors
Optical_telescope
Astronomical observatory in Nice, France
1880s). In the records for the largest refracting telescopes, all three were outperformed by the 91 cm (36 in) refractor installed at the Lick Observatory
Nice_Observatory
Astronomical observatory in Wisconsin, USA
doublet lens refracting telescope, the largest refractor ever successfully used for astronomical observation. The Swedish 1-m Solar Telescope in the Canary
Yerkes_Observatory
Italian physicist and astronomer (1564–1642)
others, among the first to use a refracting telescope as an instrument to observe stars, planets or moons. The name "telescope" was coined for Galileo's instrument
Galileo_Galilei
Type of reflecting telescope
eyepiece. They are free of chromatic aberration found in refracting telescopes. Newtonian telescopes are usually less expensive for any given objective diameter
Newtonian_telescope
Telescopes which utilize curved mirrors to form an image
image. The reflecting telescope was invented in the 17th century by Isaac Newton as an alternative to the refracting telescope which, at that time, was
Reflecting_telescope
Large telescope with a lens
century. Great refractors were large refracting telescopes using achromatic lenses (as opposed to the mirrors of reflecting telescopes). They were often
Great_refractor
Historic site in New South Wales, Australia
(16 in) Schmidt-Cassegrain telescope and an historic 29-centimetre (11 in) refractor telescope built in 1874, the oldest telescope in Australia in regular
Sydney_Observatory
Telescope in California, United States
The James Lick Telescope is a refracting telescope built in 1888. It has a lens, which is 91 centimetres (36 in) in diameter—a major achievement in its
James_Lick_telescope
Science center in California
(Present) Observatory built: 2000, at Skyline Boulevard Leah Type - Refracting telescope Maker - Alvan Clark & Sons, 1883 Aperture – 8 inches Focal Length
Chabot Space and Science Center
Chabot_Space_and_Science_Center
Atmospheric Cherenkov telescope used to detect gamma rays Infrared telescope Radio telescope Submillimeter telescope Ultraviolet telescope (see also Ultraviolet
List_of_telescope_types
Largest practical refracting telescope, the Yerkes Observatorys' 40 inch (101.6 cm) refractor, is built. 1900 — The largest refractor ever, Great Paris
Timeline of telescope technology
Timeline_of_telescope_technology
Refractor in the Penteli Observatory, Greece
for Robert Stirling Newall and when completed it was the largest refracting telescope in the world. It was located at Newall's private observatory until
Newall_Telescope
Optical sighting device for firearms
called a scope informally, is an optical sighting device based on a refracting telescope. Sights are equipped with a referencing pattern (reticle) mounted
Telescopic_sight
Double telescope in Meudon, France
Refractor (also known as the Grande Lunette) is a double telescope with lenses (83 cm + 62 cm), in Meudon, France. It is a twin refracting telescope built
Meudon_Great_Refractor
optical telescopes in North America. A list of optical telescopes located in North America by aperture. Some of the big traditional refracting lens telescopes
List of the largest optical telescopes in North America
List_of_the_largest_optical_telescopes_in_North_America
Historic 6-inch refracting telescope
The Napoleon III Telescope is an historic 6-inch refracting telescope owned by the University of Notre Dame. The telescope was given to the university
Napoleon III Telescope (University of Notre Dame)
Napoleon_III_Telescope_(University_of_Notre_Dame)
Observatory in London, England
ball. 1838 - Sheepshanks equatorial, a 6.7 inches (170 mm) aperture refracting telescope installed. 1852 - Time signals were distributed through telegraph
Royal_Observatory,_Greenwich
Astronomical observatory and historic landmark in Arizona, US
discovered in 1930 by Clyde Tombaugh. Lowell is home to a 24-inch Clark Refracting Telescope, built in 1896, which is still in use today for public observing
Lowell_Observatory
optical refracting telescopes List of optical telescopes List of proposed space telescopes List of radio telescopes List of solar telescopes List of space
Lists_of_telescopes
a telescope. Objective: The first lens or curved mirror that collects and focuses the incoming light. Primary lens: The objective of a refracting telescope
List of telescope parts and construction
List_of_telescope_parts_and_construction
World's largest telescopes
telescope Lists of telescopes List of optical telescopes List of largest optical reflecting telescopes List of largest optical refracting telescopes List
List of largest optical telescopes historically
List_of_largest_optical_telescopes_historically
of the world Selected largest telescopes Sidereal Messenger Large refracting telescopes (date 1884) Portals: Astronomy Stars Outer space Solar System
List of largest optical reflecting telescopes
List_of_largest_optical_reflecting_telescopes
German astronomer and mathematician (1571–1630)
refracting telescope, the Keplerian telescope, which became the foundation of the modern refracting telescope, while also improving on the telescope design
Johannes_Kepler
Refracting telescope design that reduces chromatic aberration
The achromatic telescope is a refracting telescope that uses an achromatic lens to correct for chromatic aberration. When an image passes through a lens
Achromatic_telescope
First known photographer of a solar eclipse
for taking the first photograph of the solar eclipse with a small refracting telescope. Nicholls, Will (2017-08-05). "This First-Ever Solar Eclipse Photo
Julius_Berkowski
Tubeless telescope (17th century)
An aerial telescope is a type of very long focal length refracting telescope, built in the second half of the 17th century, that did not use a tube. Instead
Aerial_telescope
Emergence of modern science (1572-1687)
Gregorian telescope was built. In 1666, Newton argued that the faults of the refracting telescope were fundamental because the lens refracted light of
Scientific_Revolution
Largest refracting telescope in history
Great Paris Exhibition Telescope of 1900, with an objective lens of 1.25 m (49 in) in diameter, was the largest refracting telescope ever constructed. It
Great Paris Exhibition Telescope of 1900
Great_Paris_Exhibition_Telescope_of_1900
English design engineer
Zerochromat retrofocally corrected refractor, including a folded 30-inch f/12 version he built in 1999. This refracting telescope is the largest ever built by
John_Wall_(inventor)
Observatory in Denver, Colorado, US
began in 1890. The 20-inch objective lens for the observatory's main refracting telescope was made by Alvan Clark & Sons, and the mount was built by George
Chamberlin_Observatory
Observatory
observatory's facilities by commissioning a 218mm Merz Equatorial Refracting Telescope to the German constructor Georg Merz. In 1946 the observatory became
Brera Astronomical Observatory
Brera_Astronomical_Observatory
Astronomical observatory in Evanston, Illinois
5-inch (470 mm) aperture great refractor telescope for Dearborn Observatory, which was one of the largest refracting telescope lens in existence at the time
Dearborn_Observatory
American astronomer and instrument maker
Sons, made many of the record-breaking refracting instruments, including the still-largest refracting telescope at the Yerkes Observatory, gaining "worldwide
George_Bassett_Clark
Line of Maksutov-Cassegrain telescopes
expanded to 105 mm, and 125 mm Maksutov Cassegrains and achromatic refracting telescopes in sizes of 60 mm and 70 mm, but these two models were later replaced
Meade_ETX_telescope
Refractor telescope in California, US
The Carnegie telescope (i.e. Carnegie double astrograph) is a twin 20-inch (510 mm) refractor telescope located at Lick Observatory in California, United
Carnegie_telescope
German-Dutch lens crafter (1570–1619)
1619. Hans Lipperhey is known for the earliest written record of a refracting telescope, a patent he filed in 1608. His work with optical devices grew out
Hans_Lipperhey
Telescope at Paris Observatory, installed in 1857
Arago telescope (Lunette Arago) is a 38 cm (15 inch) aperture refracting telescope at Paris Observatory, installed in 1857. Francois Arago ordered this
Arago_telescope
Physical phenomenon relating to the direction of waves
In physics, refraction is the redirection of a wave as it passes from one medium to another. The redirection can be caused by the wave's change in speed
Refraction
Research facility for astrophysics in Germany
Berlin, though the Einstein Tower solar observatory and the great refractor telescope on Telegrafenberg in Potsdam belong to the AIP. The key topics of
Leibniz Institute for Astrophysics Potsdam
Leibniz_Institute_for_Astrophysics_Potsdam
Type of catadioptric telescope
instrument with the long focal length of a refracting telescope with the lower cost per aperture of a reflecting telescope. The compact design makes it very portable
Schmidt–Cassegrain_telescope
Instrument in space to study astronomical objects
obstruction by clouds, and distortions due to atmospheric refraction such as twinkling. Space telescopes can also observe dim objects during the daytime, and
Space_telescope
American solar astronomer (1868–1938)
world-leading telescopes: the 40-inch refracting telescope at Yerkes Observatory; the 60-inch Hale and 100-inch Hooker reflecting telescopes, both at Mount
George_Ellery_Hale
simple refracting telescope for field use, designed by Major Baden-Powell, F.R.A.S.. Consisting of only one lens, it is the simplest of all telescopes, and
Baden-Powell's_unilens
Optical devices treating collimated light
Telescopic beam expanders include refracting and reflective telescopes. A refracting telescope commonly used is the Galilean telescope which can function as a simple
Beam_expander
Property in optics
des Brechungsverhältnisses is index of refraction Brewster, David (1815). "On the structure of doubly refracting crystals". Philosophical Magazine. 45
Refractive_index
Topics referred to by the same term
singer Another term for a hand-held refracting telescope for terrestrial observation A monocular, a compact refractor "Spy Glass", a recurring sketch on
Spyglass
Imaging of astronomical objects
century saw the worldwide construction of refracting telescopes and sophisticated large reflecting telescopes specifically designed for photographic imaging
Astrophotography
an optical refracting telescope, the first recorded functional telescope 1609 – Galileo Galilei builds his first optical refracting telescope 1616 – Niccolò
Timeline of telescopes, observatories, and observing technology
Timeline_of_telescopes,_observatories,_and_observing_technology
Optical device
A monocular is a compact refracting telescope used to magnify images of distant objects, typically using an optical prism to ensure an erect image, instead
Monocular
Closest known white dwarf star to Earth
Observatory, which was one of the largest refracting telescope lenses in existence at the time, and the largest telescope in the United States. Sirius B's sighting
Sirius_B
Branch of physics that studies light
appears three dimensional when used by humans. The first telescopes, called refracting telescopes, were also developed with a single objective and eyepiece
Optics
Observatory in Los Angeles, California
have looked through the 12-inch (30.5 cm) Zeiss refracting scope, making it the most viewed telescope in the world. The space theme prevails in the interior
Griffith_Observatory
light, and which tarnished, requiring maintenance. Two-element refracting telescopes were extensively used in 19th century observatories despite their
List of largest optical telescopes in the 19th century
List_of_largest_optical_telescopes_in_the_19th_century
Astronomical company
Dobsonian telescopes in 2000, followed by Maksutov–Cassegrains in 2001, and Apochromat ED-APO refracting telescopes in 2004. Sky-Watcher sells telescopes from
Sky-Watcher
Galaxy in the constellation Sagittarius
was discovered by E. E. Barnard on 17 August 1884, with a six-inch refractor telescope. It is the closest non-satellite galaxy to the Milky Way, but lies
NGC_6822
Telescope built in 1791
The Shuckburgh telescope or Shuckburgh equatorial refracting telescope was a 4.1 inches (10.4 cm) diameter aperture telescope on an equatorial mount completed
Shuckburgh_telescope
American maker of optics
that became famous for crafting lenses for some of the largest refracting telescopes of the 19th and early 20th centuries. Founded in 1846 in Cambridgeport
Alvan_Clark_&_Sons
American businessman, author, mathematician, and astronomer (1855–1916)
refracting telescope was installed at his new Flagstaff, Arizona observatory. Lowell observed the planet high in the daytime sky with the telescope's
Percival_Lowell
Brightest star in Earth's night sky
5-inch (470 mm) aperture great refractor telescope for Dearborn Observatory, which was one of the largest refracting telescope lenses in existence at the
Sirius
Sighting device used in astronomy and stargazing
stargazing, typically a small auxiliary refracting telescope/monocular mounted parallelly on a larger astronomical telescope along the same line of sight. The
Finderscope
1850s telescope near London, England
uniquely designed telescope with nearly double the aperture of the next largest refracting telescopes, making it the largest refracting telescope in the World
Craig_telescope
United States historic place
purchase a new refracting telescope as their old telescope, a 9.6in refractor, had been outdated since its purchase. The new telescope was purchased from
Old_Naval_Observatory
Observatory in Cincinnati, Ohio, US
buildings housing an 11-inch (28 cm) and 16 inch (41 cm) aperture refracting telescope. It is the oldest professional observatory in the United States.
Cincinnati_Observatory
Optical device which transmits and refracts light
the refracting telescope in 1608, both of which appeared in the spectacle-making centres in the Netherlands. With the invention of the telescope and microscope
Lens
X-ray source magnifier
travel nearly perpendicular to the reflecting or refracting surface. Conventional mirror telescopes work poorly with X-rays, since X-rays that strike
Wolter_telescope
Optical system where refraction and reflection are combined
type of catadioptric telescope. They consist of a single-element refracting telescope objective combined with a silver-backed negative lens (similar to
Catadioptric_system
Observatory
sandstone and has a distinctive 7 m dome, which houses a Victorian refracting telescope, a small planetarium, and display areas. The dome is one of two made
Mills_Observatory
Observatory
and historic 11.5-inch Alvan Clark & Sons refracting telescope, one of the few remaining large refractors of its type still in use. The observatory atop
Landolt Astronomical Observatory
Landolt_Astronomical_Observatory
Diffuse nebula in the constellation Orion
Peiresc, on November 26, 1610, when he recorded observing it with a refracting telescope purchased by his patron Guillaume du Vair. The first published observation
Orion_Nebula
First successful mirror telescope
that the lens of any refracting telescope would suffer from the dispersion of light into colours (chromatic aberration). The telescope he constructed used
Newton's_reflector
Type of telescope mount
telescope", which was a very long focal length refracting telescope that did not use a tube. In these telescopes a hand held eyepiece and an objective mounted
Infinite-axis_telescope
Telescope on La Plama, Canary Islands
The Swedish Solar Telescope (SST), also known as the Swedish 1-meter Solar Telescope, is a refracting solar telescope at Roque de los Muchachos Observatory
Swedish_Solar_Telescope
18th-century British mathematician and scientific instrument maker (1735–1800)
his honour. In 1791, he completed the Shuckburgh telescope, an equatorial mounted refracting telescope. His most celebrated work was a 5-feet vertical
Jesse_Ramsden
Highly reflective copper-tin alloy
impracticalities in using the metal made most astronomers prefer their smaller refracting telescope counterparts. Speculum metal was very hard to cast and shape. It
Speculum_metal
Observatory
observations. It boasted of an 8" Cooke Astrograph and a 15" Grubb refractor telescope. It was founded by Nawab Zafar Yar Jung Bahadur, a rich Nobleman
Nizamia_observatory
Observatory in Ottawa, Canada
Observatory in Britain. The main instrument was a 15-inch refracting telescope, the largest refractor ever installed in Canada, although modest compared to
Dominion_Observatory
Telescope in the Palomar Observatory
wavelengths.[when?] The telescope was originally hand-guided through one of two 10-inch-aperture (0.25 m) refracting telescopes mounted on either side
Samuel_Oschin_telescope
Pair of telescopes mounted side-by-side
field glasses is an optical instrument made of a pair of identical refracting telescopes mounted side-by-side towards the same direction, providing the user
Binoculars
German physicist (1787–1826)
Merz & Mahler Refracting Telescope (Comet Seeker)". National Museum of American History. "Utzschneider, Reichenbach and Fraunhofer Telescope". National Museum
Joseph_von_Fraunhofer
Historic astronomical telescope
Potsdam Great Refractor (Große Refraktor) is an historic astronomical telescope in an observatory in Potsdam, Brandenburg, Germany. Completed in 1899
Potsdam_Great_Refractor
British lawyer and inventor
He used the achromatic lens to build the first achromatic telescope, a refracting telescope free from chromatic aberration (colour distortion). He lived
Chester_Moore_Hall
Compact high-power telescope
the objective, the more massive and expensive the telescope. The optical assembly has a small refracting objective lens, an internal image-erecting system
Spotting_scope
Astronomical observatory in California
designed and built the telescope mounting. The telescope, built with this lens, became the world's largest refracting telescope from when it saw first
Lick_Observatory
Type of refracting telescope
A copyscope is type of refracting telescope that can be made by hand rather than bought in which the objective lens comes from an old photocopy machine
Copyscope
Archaic unit of length, about 27 mm
Paris inch is the lens measurement of the first great refractor telescope, the Dorpat Great Refractor, also known as the Fraunhofer 9-inch. The 9-Paris inch
Paris_inch
Observatory in Austria
Grubb Telescope Company. At that time, it was the world's largest refracting telescope. Land for the new observatory was purchased in 1872, and was noted
Vienna_Observatory
Observatory
and was named after him. In 1932, the University received a 6-inch refractor telescope from the estate of Mr. John Joynson of Liverpool. This was initially
UCL_Observatory
wavelengths. See also List of largest optical refracting telescopes, as this list does yet not include such large refractors as the Yerkes Observatory. This table
List of largest optical telescopes in the 20th century
List_of_largest_optical_telescopes_in_the_20th_century
Support mechanism with rotation about the horizontal and vertical axes
(320 in) telescopes at Paranal Observatory. The entire building constitutes the altazimuth mount, saving on mass and cost. A refracting telescope (with finderscope
Altazimuth_mount
Manufacturer of telescopes, etc., based in Watsonville, California
John Diebel, Meade started as a mail order seller of small refracting telescopes and telescope accessories manufactured by the Japan-based Towa Optical
Meade_Instruments
Topics referred to by the same term
A monocular is a modified refracting telescope. Look up monocular in Wiktionary, the free dictionary. Monocular may also refer to: Monocular vision, vision
Monocular_(disambiguation)
Castle located in Collooney, County Sligo, Ireland
1830s the Observatory on the grounds of the Castle had the largest refracting telescope in the world. What today is known as the asteroid 9 Metis was discovered
Markree_Castle
British instrument maker
refractor for Robert Stirling Newall; sadly, Thomas died before seeing it completed. For some years the Newall was the largest refracting telescope in
Thomas Cooke (scientific instrument maker)
Thomas_Cooke_(scientific_instrument_maker)
Dutch mathematician and physicist (1629–1695)
Huygens began grinding lenses with his brother Constantijn to build refracting telescopes. He discovered Saturn's biggest moon, Titan, and was the first to
Christiaan_Huygens
Tool for telescope alignment
Amateur astronomers in particular use them to collimate reflecting or refracting telescopes. Some modern models of Cheshire eyepieces in common use include
Cheshire_eyepiece
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REFRACTING TELESCOPE
REFRACTING TELESCOPE
Surname or Lastname
English (western England and south Wales)
English (western England and south Wales) : probably a variant (reflecting a local pronunciation) of the English topographic name Broadhouse, from Old English brÄd ‘broad’, ‘extensive’ + hÅ«s ‘house’.English (western England and south Wales) : alternatively, perhaps, a habitational name from Broadwas in Worcestershire, which is named with Old English brÄd + an unattested element wæsse ‘alluvial land’.
Boy/Male
Indian, Punjabi, Sikh
Reflecting on the Soul
Surname or Lastname
English (West Country)
English (West Country) : topographic name for someone who lived in a low-lying marshy area, from Old English fenn ‘marsh’, ‘bog’, reflecting the voicing of f that was characteristic of southwestern dialects of Middle English.
Surname or Lastname
English
English : from Middle English corage, Old French corage, curage in the sense ‘stout (of body)’.English : habitational name from Cowridge End in Luton, Bedfordshire, reflecting a former pronunciation of the place name.English : possibly a variant of Kendrick 3, via a hypothetical variant, Kenwright.
Surname or Lastname
German
German : habitational name from Bramel near Stade, Lower Saxony.German : nickname for a person with a sharp tongue, from Middle Low German breme, brame, ‘thorn bush’, later ‘horsefly’.English : altered form of Bramhall reflecting the local pronunciation. Compare Brammell.
Surname or Lastname
English
English : variant spelling of Beauchamp, reflecting the normal English pronunciation.
Girl/Female
Arabic, Muslim
A Bright Face Reflecting Lustre and Freshness; One with Healthy or Happy Looks
Surname or Lastname
English
English : variant of Laity.Americanized spelling of the Swiss family name Lüthi or Lüthy (reflecting the pronunciation of th as t in German) (see Luthi).
Surname or Lastname
English
English : unexplained. Possibly a variant of Marston, reflecting a local pronunciation, or a habitational name from Mastin Moor in Derbyshire.
Surname or Lastname
English
English : origin uncertain; possibly an altered spelling of Wheelhouse, reflecting a local pronunciation.
Surname or Lastname
English
English : habitational name (reflecting the pronunciation of the place name) for someone from Finchale in Durham, named from Old English finc ‘finch’ + halh ‘nook or corner of land’.English : possibly a metonymic occupational name or topographic name from Middle English fenkel ‘fennel’. Compare Fennell.Respelling of German Finkel.
Surname or Lastname
English
English : from a female personal name, Osanna, derived from a Hebrew liturgical word rendered in Latin as Hosanna (see 2).French (Normandy) : from a medieval personal name, derived from an old name for Palm Sunday, reflecting the liturgical chant of Hosanna used on that day to represent the acclamation of Jesus when he rode into Jerusalem (Matthew 21:8–9).Dutch and German : from a variant of the female personal name Susanna, influenced by the liturgical word hosanna (see 1 and 2).
Boy/Male
Indian, Punjabi, Sikh
One Reflecting on God
Boy/Male
Indian, Punjabi, Sikh
Reflecting on Divine Knowledge
Boy/Male
Indian, Punjabi, Sikh
Reflecting on the Lord
Surname or Lastname
English
English : variant of Prestwich, reflecting the old local pronunciation of the place name.
Surname or Lastname
English
English : habitational name from any of various places, for example in Kent and Wiltshire, named Gore, from Old English gÄra ‘triangular piece of land’ (a derivative of gÄr ‘spear’, with reference to the triangular shape of a spearhead).French : nickname for a gluttonous and idle individual, from Old French gore ‘sow’ (of allegedly imitative origin, reflecting the grunting of the animal).
Surname or Lastname
English
English : variant of Prestwich, reflecting the old local pronunciation of the place name.
Surname or Lastname
Jewish (eastern Ashkenazic)
Jewish (eastern Ashkenazic) : variant of Hellmann (see Heller), reflecting varieties of Yiddish in which there is no h.German (Elmann) : from a short form of the Germanic personal name Adelman, composed of the elements adal ‘noble (family)’ + man ‘man’.English : occupational name for a seller of oil, from Middle English ele ‘oil’ + man ‘man’.
Surname or Lastname
English
English : unexplained; possibly a variant of Meadows (see Meadow), reflecting a local pronunciation.
REFRACTING TELESCOPE
REFRACTING TELESCOPE
REFRACTING TELESCOPE
REFRACTING TELESCOPE
REFRACTING TELESCOPE
REFRACTING TELESCOPE
REFRACTING TELESCOPE
n.
Act of refraining.
n.
A refracting telescope, in which the image to be viewed is formed by the refraction of light in passing through a convex lens.
a.
Of or pertaining to dioptrics; assisting vision by means of the refraction of light; refractive; as, the dioptric system; a dioptric glass or telescope.
n.
The change in the direction of a ray of light, and, consequently, in the apparent position of a heavenly body from which it emanates, arising from its passage through the earth's atmosphere; -- hence distinguished as atmospheric refraction, or astronomical refraction.
adv.
In a detracting manner.
n.
One guilty of regrating.
a.
Pertaining to, or possessing, refringency; refractive; refracting; as, a refringent prism of spar.
a.
Given to reflection or serious consideration; reflective; contemplative; as, a reflecting mind.
n.
Any abnormal condition of the refracting powers of the eye.
p. pr. & vb. n.
of Retract
n.
A device for reflecting sound.
n.
The act of redacting; work produced by redacting; a digest.
p. pr. & vb. n.
of Refract
n.
The act of refracting, or the state of being refracted.
n.
A reflecting telescope.
a.
Serving or having power to refract, or turn from a direct course; pertaining to refraction; as, refractive surfaces; refractive powers.
n.
The correction which is to be deducted from the apparent altitude of a heavenly body on account of atmospheric refraction, in order to obtain the true altitude.
v. t.
The act of refraining.
a.
Reflecting sound.
a.
Serving or tending to refract; as, a refracting medium.
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