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ACCURACY alcohol amounts astronomer average carded caused center Coating Glass coating on ordinary coating on plate coating on Residence combination common shift comparatively component conditions Consequently constant corner data concerning decrease depending designates ordinary coating designates thin coating determine developing process difference distance drying edge effect of measuring errors due evident exposure fact February figure film shift found four guiding error images Independent indicates investigation Jour larger Leander least machine magnitude McCormick Observatory method nary nineteen obtained offer order ordinary emulsion ordinary glass orientating personal errors photo PHOTOGRAPHIC plate and thirty plate were reduced possible probable error Publ range ratio reason reference stars refractor regular relative stellar positions Residence Plate glass residuals results scale screw seemed separate show shown six plates smaller standard stock systematic effect TABLE taken test thickness thin emulsion Thin Plate thirty central stars thought total error types uniform Unusual usual Values visual