The x-height can be used to determine the type size of text in printed documents after the document has been printed.
I measured the x-height, line spacing, and line length in 114 scientific journals, 110 novels, and 106 A5-size brochures (210 x 148.
I took all measures - x-height, line spacing, and line length - in millimeters.
First, I will present the results of the x-height and line spacing measurements.
A second indication that typographic guidelines and practical documents differ is that the line spacing for type with the same x-height varies considerably.
Unfortunately, it is not possible to relate the actual measures of x-height and line spacing of text to the original point sizes in which a text was specified.
I took the most frequently appearing x-height in my study, 1.
90 mm for the x-height is similar to the range of 8-14 points body height.
Figure 7 shows a scatter plot of the relationship between x-height and line length in 110 novels.
The variation in line length for type with the same x-height is large.
There seem to be distinct boundaries within which document developers of scientific journals, novels, and brochures specify x-height, linespace, and line length.