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At the Measuring Engine
The Method of Reduction
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02 The normal 1n Arc 1n R1ght Ascens1on 8th-magnitude star Allegheny Observatory Angle Observers Quality annum atmospheric dispersion bisection brighter co-ordinates COMPARISON STARS Dependence Computed Adopted corresponding to unit D1ameter longitude Date Hour Angle Days Residual declination deduced parallax determinations difference double star eyepiece F Fair F Poor Fair Telescope East Fedorenko Flint transit circle focus Groombridge 34 guiding error heliometer Hour Angle Observers hour-angle error Images Remarks July 25 Kapteyn latitude magnitude mean measured by Miss method micrometer millimeter minutes of arc Miss Ware normal equations Observatory obtained parallax star plate-carrier Plates of Lalande plates secured plates taken plates were secured present Probable error corresponding proper motion Quality of Images reduced Reduct1ons 1n Decl1nat1on Reduct1ons 1n R1ght refractor region right ascension rotating disk scale Second exposure poor Sept TABLE 1 Plates TABLE 2 Reduct1ons unit weight Weight Parallax Factor Yerkes Observatory yield