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accuracy adjustment Allegheny Observatory average carriage clamp south clock closing sum column common pairs computed correction daily variation Date declinations determined distortion dried effect errors of measurement exposure film focal length focusing rod following table Gaithersburg hour angle images International Geodetic Association July June June 9 Kimura term latitude observations latitude variation mean latitude mean value mercury basin mercury surface meridian meridian circle microscope millimeter necessary night error normal curve number of stars objective observatory obtained orientation oscillations period personal equation photographic instrument photographic plate plate holder position prime vertical proper motion reduction refraction reseau line reversal right ascension rotary scale value secured Sept shown sixth column star trail systematic errors TABLE 16.—Individual latitudes thread variation of latitude vertical visual and photographic visual instrument visual—Continued zenith distance zenith telescope
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