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@nina_kali_nina Now, why a full page was ~exactly 4 times as large as Quarto used in books?

Most likely this has to do with how books printed are bound. Each printed sheet going into a binding process is is actually 4 pages of the book: Front and back of that page plus front and back of the another page that is then folded and stitched together in the binding process. Modern presses actually print much larger sheets and then they are cut up before going through binding processes but even 125 years ago they probably printed the sheets and cut them apart because it was cheaper/more efficient.