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With a meridian photometer of augmented power, the surprising number of 473,216 settings were made during the years 1891-98, nearly all by the indefatigable director himself, and they afforded materials for a "Photometric Durchmusterung," published in 1901, including all stars to 7·5 magnitude north of declination -40°. A photometric zone, 20° wide, has for some time been in course of observation at Potsdam by MM. Müller and Kempf.
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