Prepress Preparation, ContinuedLine lengthThe length of a line is measured in picas. Picas are also used to measure thewidth and length of pages and columns. There are 12 points to a pica andapproximately 6 picas to an inch. Do not use points and picasinterchangeably as they do not precisely coincide as a unit of measure. Usethe point system or a line gauge to specify instructions to a typesetter. Sometypesetters prefer specifications in picas only.Figure 1-16 shows a line gauge or printer's rule.Figure 1-16. —A printer's rule or line gauge; A. The pica and inchscale, B. The agate and inch scale.Continued on next page1-21
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