are in types but little larger than the note type, a cross-rule may be of service in separating notes from extracts. When notes are in half measure the cross-rule is not needed.
The hair-line rule over the note or under the running title is often of thin brass, with its face cut to a sharp angle. This face, easily bent or gapped, is electrotyped with difficulty, and it may appear in print with the defects of gaps or crookedness, or thick at one end of the line and thin at the other. It is rare to find in any book hair-line rules printed with perfect uniformity.
NOTES IN HALF MEASURE
When small type is selected for foot-notes that may be of unequal length, the notes may be put in half measure. The space between the two columns should not be wider than the em quad of the type of the note, and may be still narrower. The halfmeasure note saves space in turned-over lines, and presents a neater appearance than that made by the straggling lines of the broad measure, with its frequent gaps of white produced by short lines that sometimes contain one syllable only.
The use of half measure for notes gives to them a distinction that they do not have when set in a broad measure, and it differentiates them from the
