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For Sirius I Plares (8 inch Draper) 163" to a mm For Sirius B Plates (8 inch Draper) 179" to a mm *For Sirius A Plates (24 inch Bruce) 60" to a mm For Sirius I Plates multiply the [[strikethrough]] log [[/strikethrough]] secant of Dec. by ^[anti] log 1.03623 For Sirius B Plates multiple the [[strikethrough]] log [[/strikethrough]] secant of Dec. by ^[anti] log 1.07700 *For Sirius A Plates multiply the [[strikethrough]] log [[/strikethrough]] secant of Dec. by ^[anti] log 0.60206. In computing positions of Variable stars, A.G.C. positions of comparison stars are used in preference to Z.C. positions when a star appears in both catalogues. per order of Mrs. Fleming In Table I, R.A. is carried out to hours, minutes, Volume XLVII second, & tenths, Dec. is carried out to degrees, minutes & whole seconds, when they are seconds. copied from Mrs. Fleming's Book 15., October 26, 1906 J.C.S.M. *For Sirius A Plates multiply the natural secant of the declinations by 4. Rules for Precision. [[end page]] [[start page]] [[blank page]]