Quarto (abbreviated Qto, 4to or 4º) is the format of a book or pamphlet produced from full sheets printed with eight pages of text, four to a side, then folded twice to produce four leaves. The leaves are then trimmed along the folds to produce eight book pages. Each printed page presents as one-fourth size of the full sheet.
The earliest known European printed book is a quarto, the Sibyllenbuch, believed to have been printed by Johannes 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 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.
There are variations in how quartos were produced. For example, bibliographers call a book printed as a quarto (four leaves per full sheet) but bound in gatherings of 8 leaves each a "quarto in 8s."McKerrow, p. 28.
The actual size of a quarto book depends on the Paper size on which it was printed. A demy quarto (abbreviated demy 4to) is a chiefly British term referring to a book size of about , a medium quarto , a royal quarto , and a small quarto equalled a square octavo, all untrimmed.Chambers English Dictionary
The earliest surviving books printed by movable type by Gutenberg are quartos, which were printed before the Gutenberg Bible. The earliest known one is a fragment of a medieval poem called the Sibyllenbuch, believed to have been printed by Gutenberg in 1452–53. British Library, Incunabula Short Title Catalogue, entry for the Sybyllenbuch .Margaret Bingham Stillwell, The Beginning of the World of Books, 1450–1470, Bibliographical Society of America, New York, 1972, pp. 3–4, described as a medieval poem printed in about 1451–52, but not identifying the format. Quartos were the most common format of books printed in the incunabula period (books printed before 1501). The British Library Incunabula Short Title Catalogue currently lists about 28,100 different editions of surviving books, pamphlets and broadsides (some fragmentary only) printed before 1501, Search of Incunabula Short Title Catalog for imprints before 1501, sorted by date. Search done July 12, 2009. of which about 14,360 are quartos, representing just over half of all works in the catalogue.
Other playwrights in this period also published their plays in quarto editions. Christopher Marlowe's Doctor Faustus, for example, was published as a quarto in 1604 (Q1), with a second quarto edition in 1609. The same is true of poems, Shakespeare's poem Venus and Adonis being first printed as a quarto in 1593 (Q1), with a second quarto edition (Q2) in 1594.
In Spanish culture, a similar concept of separate editions of plays is known as comedia suelta.
From the 19th century, the term "sermon paper" in British usage could refer to foolscap quarto writing paper.
- "sermon paper [...] Writing paper of foolscap 4to size."
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