space out

In letterpress and linotype work, to space out means to enlarge the gaps between characters, words, or lines of type by inserting metal or wooden spacers into the assembled forme. The compositor achieves this either by replacing standard spacing material with thicker pieces, or by adding extra spaces (quads, ems, or thin spaces) between letters or words before locking the forme into the chase.

The technical reason for spacing out is straightforward: a line of type that measures slightly short of the column width will not lock solidly in the chase, risking type falling out during printing. Rather than reset the entire line, the compositor spaces out by distributing extra space across word gaps or letter pairs. This is faster than resetting but requires judgment to keep spacing optically even and readable.

Spacing out differs fundamentally from setting tight, where extra characters are crammed in. It also differs from leading, which refers specifically to the insertion of lead strips between lines of type to increase vertical distance. Horizontal spacing out works within a line; leading works between lines. Both techniques were essential in hot-metal composition when column widths had to be filled precisely and justification was non-negotiable.

The practice created a real constraint: a line spaced out too much becomes hard to read, with isolated words floating across the measure. Linotype operators learned to space out conservatively, often preferring to recompose rather than stretch a line beyond about one or two extra points of space. The term survives in digital typesetting vocabulary, though the mechanical limitation that made it necessary has vanished.