How mechanical typesetting works. The film explores the intricate workings of mechanical typesetting machines, particularly the linotype and intertype machines, which revolutionized printing in the late 19th century. It details the process of composing, casting, and distributing type for printing, emphasizing the roles of various components such as keyboards, matrices, and casting mechanisms. The film also highlights advancements in automation, including the use of perforated tape to operate the machines without direct human intervention, allowing for high-speed typesetting essential for modern publishing.

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