FACTS ABOUT PRINTING AND BOOK-MAKING. ^Ou 



which, at the time the sizes of books acquired their names, 

 was the largest sheet manufactured. Thus, a sheet of that 

 size folded once, making 2 leaves or 4 pages, was called a 

 folio volume ; folded twice, making 4 leaves or 8 pages, was 

 called a quarto volume ; folded four times, making 8 leaves 

 or 16 pages, was called an octavo ; folded six times, making 

 12 leaves or 24 pages, was called a duodecimo, &c. They 

 are written thus : 2fo., 4to, 8vo, 16mo, &c. 



Afterwards, when the sheets came to be manufactured 

 larger, books continued to be designated as above, but were 

 distinguished from the above sizes by giving the new sheets 

 names, and prefixing the name of the sheet to the above. 

 Thus, a sheet 22 inches by 28 was called " Royal," and hence 

 books printed on it were called royal folio, royal quarto, 

 royal octavo, &c. 



TABLE, showing the number of lewes and pages from the 

 folding of a sheet. 



Folds. Leaves. Pages. 



2fo 1 2 4 



4to 248 



8vo 4 8 16 



12rno 6 12 24 



16mo 8 16 32 



18mo 9 18 36 



24mo 12 24 48 



^32mo 16 32 64 



NOTE. The foldings, leaves, and pages of the royal sheet, 

 &c., are the same as the above, but the sheet being larger of 

 course the leaves and pages are larger. 



