Linotype Department. Copy was keyed in by hand. Moulds (called matrixes) fell down from the top of the machine and lined up in the correct order. Wedge shaped word spaces were then inserted to fill out the line of type. The whole line was then cast as a slug (hence Linotype) and the matrixes returned to the top of the machine to be re-used. After printing the slugs were melted down and the metal re-used. Before computers this is how all newspapers were set.