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Series reductions as far as page 211 in this book were made with magns. on scale of H.C. 170.

[[Strikethrough]] Series [[/strikethrough]] Magns. depending on scale measures 9.7 and fainter (13.7 and fainter with scale R) have been underlined in this book for plates taken in Series, and wherever copied.

In general, Scale U was used for MC Series plates.