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Important series of double-star observations were made by Perrotin at Nice in 1883-4; by Hall, with the 26-inch Washington equatoreal, 1874 to 1891; by Schiaparelli from 1875 onward; by Glasenapp, O. Stone, Leavenworth, Seabroke, and many besides. Finally, Professor Hussey's revision of the Pulkowa Catalogue is a work of the teres atque rotundus kind, which leaves little or nothing to be desired.
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