The most important of the signs used in making corrections for the printer are as follows:
| 1. | Delete or expunge. | |
| 2. | A turned letter. | |
| 3. | Wrong-font letter. | |
| 4. | Change capital to small letter, ("lower-case"). | |
| 5. | Insert period. | |
| 6. | Transpose words or letters as indicated. | |
| 7. | Change roman to italic. | |
| 8. | Change italic to roman. | |
| 9. | Space to be inserted. | |
| 10. | Matter wrongly altered to remain as it was originally. Dots are placed under the matter. | |
| 11. | A bad or battered letter. | |
| 12. | Space to be reduced. | |
| 13. | Close up. | |
| 14. | Push down space or lead. | |
| 15. | New paragraph. | |
| 16. | Something foreign between the lines, or a wrong-font space making the type crooked. | |
| 17. | Line to be indented one em of its own body. |
When letters or words are set double or are required to be taken out a line is drawn through the superfluous word or letter and the mark No. 1, called dele, placed opposite on the margin. (Dele is Latin for take out.)
A turned letter is noted by drawing a line through it and writing the mark No. 2 on the margin.
If letters or words require to be altered to make them more conspicuous a parallel line or lines must be made underneath the word or letter—namely, for capitals, three lines; for small capitals, two lines; and for italic, one line; and on the margin opposite the line where the alteration occurs the sign caps., small caps., or ital. must be written.
Where a letter of a different font is improperly introduced into the page it is noted by drawing a line through it and writing w. f. (wrong font) on the margin.
Where a word has been left out or is to be added a caret must be made in the place where it should come in and the word written on the margin. A caret is made thus: ^
Where letters stand crooked they are noted by a line, but where a page hangs lines are drawn across the entire part affected.
Where a faulty letter appears it is denoted by making a cross under it and placing a similar mark on the margin.
Where several words are left out or where new matter is to be added the added matter is written wherever convenient, and a line is drawn from the place of omission to the written words.