Word: coronographs
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Dates: during 1950-1959
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...flare, recorded last month, set a record for all such occurrences observed. The movies were taken with a coronograph, a special telescopic instrument, at the Air Force's Sacramento Observatory in New Mexico...
Research here is carried on with coronographs, flare photometers, and smaller equipment. The coronograph being installed this year is the largest in the world. The principal studies of this station will involve careful observations...