Blink comparator
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blink comparator
An instrument that allows astronomers to view two images of the same region of sky simultaneously. Objects that have changed their brightness or position appear to stand out of the plane of the picture.
blueshift ...
The blink comparator is an instrument that is used to compare two nearly identical photographs made of the same section of sky at different points in time.
Pluto was discovered by Clyde Tombaugh on February 18, 1930, in the Lowell Observatory in Arizona, after months of painstaking observations with a blink comparator. To make certain he had found the new planet, he made further observations.
Joseph Cornelius) Wolf (1863-1932), a pioneer of astrophotography who discovered hundreds of variable stars and asteroids, and about 5,000 nebulae by analyzing photographic plates and developing the "dry plate" in 1880 and the "blink comparator" in ...
Then the pair of plates could be put side by side into a machine called a blink comparator, in which the two images are quickly alternated (blinked) in a single viewer.
In 1977, Charles Kowal, using a blink comparator, the same device that had allowed Clyde Tombaugh to discover Pluto nearly 50 years before, discovered 2060 Chiron, an icy planetoid with an orbit between Saturn and Uranus.
"Then you would come back and map it again and then essentially use a blink comparator like in the old days, and compare the two maps and see what has changed.
blink microscope
The Columbia Encyclopedia, Sixth Edition
blink comparator
A Dictionary of Astronomy ...
 See also: Sky, Solar, Light, Astronomy, Plate
  
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