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A CORRECTED PROOF-SHEET
Author's Corrections.—No problem in the publishing of technical books gives the publisher and the author more trouble than the question of author's corrections. The term "author's corrections" covers, technically, changes made in content, arrangement or typographical style, or additions to the manuscript, after the type has been set.
The publisher, to protect himself against the author who practically rewrites his manuscript after it has been set up in type, usually provides in his contract that corrections in excess of a certain percentage of the cost of composition shall be charged to and paid for by the author. The printer makes a careful distinction between printer's corrections and author's corrections. Corrections marked in galley and page proofs of a book where the printer has not followed copy are printer's corrections. Author's corrections are changes and additions made in the proof. Obviously, where these changes make a distinct improvement in the text—that is, a better book—the publisher takes a sympathetic attitude; but when the item of author's corrections runs to a total of twenty-five or fifty per cent or more of the cost of setting up the book, there is clear indication that the author did not complete his book in the manuscript but in the proof.