This differential spacing in a line of capitals will also be required in a line having abbreviations or initials. The following line, spaced with en-quads throughout, has unnecessarily wide spaces between the initials:
Spaced with four-to-em in the last three places, it is improved:
Capitals used as initials of titles and for other abbreviations, with the accompanying periods, should be thin-spaced or set close together, as shown in the second of these examples:
Two or more lines of capitals of the same size should be spaced as nearly alike as possible. These three lines are so disproportionately spaced that they are not pleasing:
The squaring up is arbitrary and strained. The lines are better like this: