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For Series I Plates  (8 inch Draper)  163" to a mm.
For Series B Plates  (8 inch Bache)  179" to a mm.
For Series A Plates  (24 inch Bruce)  60" to a mm.
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For Series I Plates multiply the log secant of Dec by log 1.03623
For Series B Plates multiply the log secant of Dec by log 1.07700
For Series A Plates multiply the log secant of Dec by 0.060206
or multiply the natural secant by 4

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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 Mrs. Fleming

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In Table I Volume XLVII R.A. is carried out to Hours, Minutes, seconds & tenths, Dec. is carried out to degrees, minutes & whole seconds, when there are seconds