In bookmaking how many times would an quarto sheet be folded?
Quarto Quarto Quarto (abbreviated Qto, 4to or 4°) is a book or pamphlet produced from full "blanksheets", each of which is printed with eight pages of text, four to a side, then folded twice to produce four leaves (that is, eight book pages). Each printed page presents as one-fourth size of the full blanksheet. The earliest known European printed book is a quarto, the "Sibyllenbuch", believed to have been printed by Gutenberg in 1452–53, before the "Gutenberg Bible", surviving only as a fragment. Quarto is also used as a general description of size of books that are about 12 inches (30
Quarto cm) tall, and as such does not necessarily indicate the actual printing format of the books, which may even be unknown as is the case for many modern books. These terms are discussed in greater detail in Book sizes. A quarto (from Latin "quartō", ablative form of "quartus", fourth ) is a book or pamphlet made up of one or more full sheets of paper on which 8 pages of text were printed, which were then folded two times to produce four leaves. Each leaf of a quarto book thus represents one fourth the size of the original sheet. Each