Linotype is a typesetting system in which an operator uses a keyboard to assemble matrices that cast a complete line of metal type, called a slug. Introduced in the late nineteenth century, it greatly accelerated newspaper and book production compared with hand composition. Poetry posed special challenges for linotype because its short lines, varied indentation, and exact spacing often demanded close attention. The technology remains important in the history of printed verse and literary periodicals.

Invented by Ottmar Mergenthaler in 1886, the "Linotype" machine allowed operators to quickly compose whole lines of metal type ("line-o'-type") using a keyboard. This revolution in hot-metal typesetting drastically sped up book and newspaper production, democratizing access to print. In poetry history, the Linotype era influenced column widths, line lengths, and font availability for mass-market anthologies. Introducing students to Linotype mechanics helps them appreciate how technical advances in printing shaped literary layout, publication speed, and the spread of 20th-century poetry. Related terms include hot metal, Monotype, typesetting, and slug.