File:Apprentice linotype operator at Queensland Times, Ipswich, 1975 (34583024235).jpg

Linotype, typesetting machine by which characters are cast in type metal as a compete line rather than as individual characters as on the Monotype typesetting machine. It was patented in the United States in 1884 by Ottmar Mergenthaler. Linotype, which has now largely been supplanted by photocomposition, was most often used when large amounts of straight text matter were to be set.

In the Linotype system, the operator selects a magazine containing brass matrices to mold an entire font of type of the size and face specified in the copy at hand. A keyboard is manipulated (or driven by paper or magnetic computer tape) to select the matrices needed to compose each line of text, includin tapered spacebands, which automatically wedge the words apart to fill each line perfectly. Each matrix is transported to an assembling unit at the mold.

The slugs produced by the machine are rectangular solids of type metal (an alloy of lead, antimony, and tin) as long as the line or column measure selected. Raised characters running along the top are a mirror image of the desired printed line. After hot-metal casting, a distributing mechanism returns each matrix to its place in the magazine. The slug of type, air-cooled briefly, is then placed in a "stick" for insertion in the proper position into the press form being assembled or made up.

From the Encyclopaedia Britannica.