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	Blink comparator - Wikipedia, the free encyclopedia
		This blink comparator at Lowell Observatory was used in the discovery of Pluto.
		A blink comparator was a viewing apparatus used by astronomers to find differences between photographic plates taken of the same area of the sky at different times.
		However, the blinking technique is less used than before because image differencing algorithms are often used to detect moving objects more effectively than human eyes are capable of.
	en.wikipedia.org /wiki/Blink_comparator (358 words)

	Hall of Precision Astrometry, Blink Comparator
		Nothing has yet been found about the design or manufacture of the blink comparator, which appears homemade and was perhaps built in the 1920s when proper motion and parallax studies got seriously underway.
		At the time when this comparator was used, there were astronomers specializing in the study of parallaxes, proper motions, meteors, and variable stars, so it is obvious that the machine would have been very useful.
		The blink comparator was built to hold two separate 11 × 8 inch plates, using several clips on a stage (4) which is at a steep angle to the horizontal.
	www.astro.virginia.edu /~rjp0i/museum/blink.html (472 words)

	Eyes Blinking -- Recommendations and Resources
		Blink has made one of the most impressive transitions from throwaway character to star heroine in comic book history.
		thumbleft115pxMarvel Universe Blink In the primary Earth-616 continuity of the Marvel Universe, Blink was first introduced in the "Phalanx Covenant" storyline, in which the extraterrestrially-derived techno-organic beings called the Phalanx captured her and several other young mutants to assimilate their powers.
		This version of Blink was tense and panicky and frightened of her powers (having "woken up in a pool of blood" after her first use of them).
	www.becomingapediatrician.com /health/50/eyes-blinking.html (873 words)

	blink microscope - HighBeam Encyclopedia
		BLINK MICROSCOPE [blink microscope] in astronomy, device for determining a change in position or magnitude (brightness) of a star relative to other stars in the background.
		A change in position or magnitude of a star can usually be detected since the star will seem to flicker or jump to and fro while the background stars remain steady in both position and brightness.
		Mystery of Nanoparticles Concealed in the Blink of an Eye.
	www.encyclopedia.com /html/b/blinkmic.asp (238 words)

	Clyde Tombaugh
		Pluto is named after the Roman god of the underworld, who was able to render himself invisible, and in honor of Lowell.
		Tombaugh's discovery involved painstaking use of a blink comparator -- a device which allows someone to compare two similar photographs by placing them in the viewer's field of vision, and then letting the user switch back and forth -- blink -- between the two.
		Tombaugh used the blink comparator to compare photographs of sections of sky taken months apart.
	www.ebroadcast.com.au /lookup/encyclopedia/cl/Clyde_Tombaugh.html (274 words)

	Hall of Precision Astrometry, Brashear Blink Comparator
		The comparator is arranged so that one plate can be mounted on the left side of the machine and a second plate can be mounted on the right side of the machine.
		Earlier comparators had knobs or switches which flipped this mirror so that the astronomer could blink between the two plates manually, but this machine is equipped with an electronic blinker so that the astronomer could switch between plates at several different rates without actually doing the switching himself.
		The lowest blinking speed is about 2 blinks per second, and the fastest is many blinks each second.
	www.astro.virginia.edu /~rjp0i/museum/brashblink.html (1029 words)

	[16.0] The Exploration Of Pluto (Site not responding. Last check: 2007-08-31)
		The blink comparator was an optical device that allowed two photographic plates to be placed side by side and then examined under an eyepiece.
		The comparator switched the view rapidly back and forth between the plates, and anything that was different between the two plates would appear to "jump" slightly.
		The use of the blink comparator was painfully difficult.
	www.vectorsite.net /taxpl_16.html (5983 words)

	comparator
		In its normal mode of operation, comparator expects two or more command-line arguments which are the root directories of the source-code trees to be compared, and generates a report to standard output.
		This is recommended for comparing C code; it prevents the comparison from being fooled by differences in indent style.
		comparator does not attempt to do semantic analysis and catch relatively trivial changes like renaming of variables, etc. This is because comparator is designed not as a tool to detect plagiarism of ideas (the subject of patent law), but as a tool to detect copying of the expression of ideas (the subject of copyright law).
	www.catb.org /~esr/comparator/comparator.html (1543 words)

	The Discovery of Pluto - The Blink Comparator (Site not responding. Last check: 2007-08-31)
		The blink comparator is actually a microscope that optically superimposes two photographic plates, "blinking" between them so rapidly that the two plates look as one.
		The photographs are developed and carefully positioned in the blink comparator.
		In the blink comparator, this object appears to jump back and forth, revealing itself to the careful eye.
	www.discoveryofpluto.com /blink.html (266 words)

	AmericanHeritage.com / THE PURSUIT OF PLUTO
		Blinking plates could be a powerful if tedious way to detect a planet, and the comparator would ultimately be the machine to reveal Pluto.
		In 1911 he went ahead and finally ordered a blink comparator for the observatory, and he abandoned the fiveinch telescope in favor of the observatory’s new forty-inch reflector.
		Blinking a pair of plates thoroughly required several days to several weeks, depending on the number of stars.
	www.americanheritage.com /articles/magazine/it/1990/3/1990_3_50.shtml (4087 words)

	Photographic plate - Wikipedia, the free encyclopedia
		The first natural satellite discovered using photographic plates was Phoebe in 1898.
		Pluto was discovered using photographic plates in a blink comparator; its moon Charon was discovered by carefully examining a bulge in Pluto's image on a plate.
		Photographic plates were also an important tool in early high-energy physics, as they get flened by ionizing radiation.
	en.wikipedia.org /wiki/Photographic_plate (483 words)

	Article info : Blink ...or You’ll Miss It
		We named these "blink tests." A blink test is any test that alters someway of viewing the application—size, time, position, focus, or sensory mode—to take advantage of people's ability to spot patterns (or pattern exceptions) quickly.
		Blink testing, by contrast, tends to be exploratory; it's about removing information deliberately and aggressively to see otherwise invisible patterns, without knowing in advance what we'll find.
		Blink tests are intended to supplement--not replace--more thorough forms of testing and observation.
	www.stickyminds.com /se/S11309.asp (1514 words)

	blink
		The light on the buoy blinked in the distance.
		She blinked her eyes in an effort to wake up.
		We blinked the flashlight frantically, but there was no response.
	www.infoplease.com /dictionary/blink (113 words)

	Case study: comparator
		The program I wrote to address this problem is named comparator after an old-fashioned astronomical instrument called a “blink comparator” that was used to find moving objects in starfield photographs by flipping rapidly between shots taken at different times.
		The interface design of comparator is a conscious instance of what we have earlier examined in Chapter 11 as the compiler-like pattern.
		The default mode of comparator is to produce a common-segment report from its arguments, just as the default behavior of a Unix compiler is to try to produce a fully-linked executable.
	www.catb.org /~esr/writings/taoup/html/ch12s05.html (2684 words)

	Star Cruiser Observatory -- Observations
		In the past one of these techniques involved the use of a mechanical device called a blink comparator.
		These days a computer using astronomical software can be used as a virtual blink comparator putting blinking techniques into the hands of any amateur astronomer that can afford a personal computer and CCD camera for his or her telescope.
		Two or three CCD images of the same field of view are taken seperated by a period of time, say a hour.
	www.sipe.com /starcruiser/observatory/html/observations_report02_01.html (353 words)

	CCDBLINK page
		The program allows you to load two image files, align them with sub-pixel accuracy, then blink the display between the two images: Fixed objects remain steady whereas objects which have moved or have changed in brightness will blink.
		A similar routine is used for selecting two stars in the field for automatic rotation and alignment of the two images to be blinked.
		The comet's motion against the background stars is clearly seen and several very dim stars which were captured in only one frame appear to blink.
	www.sbig.com /sbwhtmls/ccdblink.htm (460 words)

	Blink Comparator 0.1.2-40 - Downloads at Builder UK
		Blink Comparator 0.1.2-40 - Downloads at Builder UK Builder UK
		Windows 95/98/Me/XP Blink Comparator significantly enhances the capabilities of the conventional blink comparator by allowing several frames and also lets you choose a common reference point like a star and align and crop all frames.
		Blink also allows you to export all aligned/cropped images to disk.
	uk.builder.com /downloads/0,39026698,39184207s,00.htm (79 words)

	BookRags: Clyde W. Tombaugh Biography
		He then used a special instrument, called a blink comparator, to examine the plates for telltale signs of moving bodies beyond the orbit of Earth.
		A blink comparator, or blink microscope, rapidly alternates--up to ten times per second--two photographic images, taken at different times, of the same field or area of the sky.
		Using his knowledge of orbital mechanics and his sharp observer's eye, Tombaugh was able to discern asteroids and comets from possible planets; a third "check" plate was then taken to confirm or rule out the existence of these suspected planets.
	www.bookrags.com /biography/clyde-w-tombaugh-wsd (1042 words)

	ASO Comet Observations (Site not responding. Last check: 2007-08-31)
		Stellar, with a bit of nebulosity at periphery; confirmed via 30-min motion in star field, blink comparator.
		This comet is not as bright as reported, at least on this night; nearly stellar with I.D. confirmed from 40-min drift via blink comparator from images.
		Very difficult and stellar in strong moonlight nearby; comet verified via blink comparator, 3 images, one hour.
	www.arksky.org /cgi-bin/cometlog.pl?request=P/2001_OG108_-_(_LONEOS) (97 words)

	comparator
		Clyde Tombaugh at work on the blink comparator at the Lowell Observatory, ca.
		A device used to look for parallax motion, proper motion, asteroids, or variable stars by quickly alternating between views of two photographic plates taken at different times; also known as a blink microscope.
		Changes in the configuration of the objects on the plates, such as the movement of a suspected planet, are detectable by their relative motion, or new objects become apparent by their alternate appearance and disappearance.
	www.daviddarling.info /encyclopedia/C/comparator.html (168 words)

	Blink Comparator (Site not responding. Last check: 2007-08-31)
		More generally, the term is also usedto refer to a device that compares two items of data.
		With a pull-up resistor and a 0 to +5 Vpower supply, for instance, the output takes on the voltages 0 or +5, and can be interfaced to TTL logic.
		When comparing a noisy signal to a threshold, the Comparator may switch rapidly from state to state as the signal crosses thethreshold.
	www.super8filmmaking.com /tail/10029-blink-comparator.html (395 words)

	Blink 182 Take Off (Site not responding. Last check: 2007-08-31)
		Please edit this article to conform to a higher standard of article quality.
		A one-take is when there is only one chance to get it right; eg.
		Off is one of two possible states for a binary switch, the other being on.
	www.super8filmmaking.com /tail/10010-blink-182-take-off.html (266 words)

	Pluto: The Discovery of a Planet - Explore the Cosmos \| The Planetary Society
		The instrument, known as a “blink comparator,” mounted two large photographic plates.
		Tombaugh was immediately on the alert, and within seconds found what he was looking for: another blinking point of light, a few millimeters to the left of the first.
		It was 45 minutes since Tombaugh had first noticed the blinking dot, and he now felt confident enough to share the news with his colleague, astronomer C.O. Lampland, across the hall.
	www.planetary.org /explore/topics/pluto/plutodiscovery1.html (551 words)

	"Future Shoes" by Michael Finley
		Young Tombaugh, brought to the observatory at age 23, found the tiny dot in the skies after only a year and 40,000 blink comparator attempts.
		Pluto was the furthest from the sun (3.66 billion miles from the sun, on average), and experienced the longest year (it revolved around the sun every 248 years, compared to Earth's 365 days).
		Fourteen months later, comparing images on his blink comparator, a tool for detecting changes in position of faraway objects by juxtaposing photographic images of where the object may be, he noticed the discrepant dot which was Planet X. "That's it," he recalls thinking.
	www.mfinley.com /articles/ClydeTombaugh.htm (1507 words)

	COMP153A – 2005 – Practical 9
		A device called a blink comparator has been used in Astronomy for many years, to look for objects moving against the fixed background of stars.
		A blink comparator is also useful for comparing digital photographs and designs.
		You might blink automatically, using a timer, or you might provide a ‘blink’ button.
	www.cs.waikato.ac.nz /~coms0108/153/Prac9.html (713 words)

	Andrew's Random Notes - Astronomy - Pluto (Site not responding. Last check: 2007-08-31)
		The search was done by taking thousands of long-exposure photographs of the sky and then comparing images of the same area taken on different nights, using a "blink comparator".
		This is essentially a simple projector, but with a mechanism to allow the user to swap rapidly from one image to another.
		When Tombaugh flicked between the two images in the blink comparator, anything that had moved would appear to "blink" on and off.
	www.randomnotes.co.uk /astronomy/pluto.htm (487 words)

	FileForum \| Blink Comparator
		Blink Comparator allows the viewing of several images.
		It was through the use of a blink comparator that resulted in the discovery of Pluto.
		Then Blink will crop and align each image on the reference point.
	fileforum.betanews.com /detail/Blink_Comparator/1124466644/1 (103 words)

	Minor Planet Search command (Research menu, Analyze Folder of Images fly-out)
		The minor planet can be seen to move in the three images thanks to the Blink Comparator..
		Instead of seeing the entire image in the Blink Comparator, you will be presented with a magnified portion of the image surrounding search candidates.
		Using the Blink Comparator with the magnified view, the movement of the minor planet is immediately obvious.
	www.bisque.com /help/CCDSoft/afxcore/Minor_Planet_Search_command.htm (2218 words)

	Blink Of An Eye -- Recommendations and Resources
		Blink Of An Eye -- Recommendations and Resources
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		Categories similar to Blink Of An Eye: Blood Clotting Disorders
	www.becomingapediatrician.com /health/17/blink-of-an-eye.html (886 words)

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