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For ^Address: Dudley Observatory, Albany, N. Y. Digitized by VjOOQ IC 202 CARNEGIE INSTITUTION OP WASHINGTON, the preliminary reduction, only those series have been used where the clock correction could be determined from groups of stars 12 hours apart and where the clock-rate could be derived from successive transits of the same stars. Thus errors in right-ascension depending upon right-ascension and any existing diurnal effect are practically eliminated, as are also the assumed positions of t...he clock stars. The series of observations used extend over periods of 24 to 130 hours, with a group of clock stars every 12 hours. In a large majority of cases there are also successive transits of a circiunpolar star to effect a determination of the azimuth independent of the assumed right- ascension. This should insure a reasonable degree of freedom from systematic error and error in the assiuned place. For the preliminary discussion, 347 series containing 4,662 observations were available. After correcting the resultant clock corrections for a term in right- ascension dependent upon declination, they were collected in the order of right-ascension, and a preliminary value of the term in right- ascension depending upon right-ascension was determined.
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