This section is from the book "Manual Of Useful Information", by J. C Thomas. Also available from Amazon: Manual of useful Information.
The name indicates the number of pages in the sheet, thus: in folio book, 4 pages or 2 leaves = 1 sheet; a quarto, or 4to., has 8 pages or 4 leaves to a sheet; an octavo, or 8vo., 16 pages or 8 leaves to a sheet. In a 12mo., 24 pages or 12 leaves = 1 sheet, and the 18mo., 36 pages, or 18 leaves = 1 sheet, and so on. The following are the approximate sizes of books:
Royal Folio | 19 inches | X 12 |
Demy | 18 " | X 11 |
Super Imp. Quarto (4to) | 151/2 " | X 13 |
Royal 4to | .121/2 " | X 10 |
Demy 4to | .111/2 " | X 81/2 |
Crown 4to | 11 " | X 8 |
Royal Octavo | 101/2 " | X 61/2 |
Medium 8vo | . 91/2 " | X 6 |
Demy 8vo | 9 " | x 51/2 |
Crown 8vo | 7 1/2 " | X 41/2 |
Foolscap 8vo | 7 " | X 4 |
12 mo | 7 " | X 4 |
16 mo | . 61/2 " | X 4 |
Square 16mo | . 41/2 " | X 31/2 |
Royal 24mo | 51/2 " | X 33/4 |
Demy24mo | 5 " | X 23/4 |
Royal 32mo | 5 " | X 3 |
Post32mo | 4 " | X 21/2 |
Demy 48mo | 33/4 " | x 21/4 |
 
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