Make-up. To measure off type matter into pages.
Off-set. It frequently occurs that as the result of insufficient drying or from other causes the impression of one sheet appears on the back of another; such work is said to off-set.
Overlays. In making ready for the press the pressman finds it necessary to add here and there, by pasting, thicknesses of paper to his roller to bring out properly the light and shade of an illustration or to get an even ink impression from the type or plates. This work is called making overlays. In expensive illustrated work specialists are engaged solely for the purpose of making overlays.
Press Proof. The final proof passed by the author or publisher.
Process-blocks. Blocks produced by the photoengraving and other mechanical processes.
Query. A mark made on a proof by the printer to call attention to a possible error, sometimes expressed by a note of interrogation (?).
Register. The exact adjustment of pages back to back in printing the second side of a sheet.
Signature. The letter or figure at the foot of a sheet to guide the binder in folding; also used by printers to identify any particular sheet.
The various marks and signs used by printers will be explained in the lesson on proof-reading.