Miscellaneous information taken from various type catalogues.
The following table shows the width, measured in points, of various sizes of spaces and quads.
|Point size of body|
|Thinner Than 5-em||1.5||2||2||2||2||3||4||4||6||6||8||9|
|5 to Em||1.5||2||2.5||3||3||3||4||6||6||9||9||12||12|
|4 to Em||1.5||2||2.5||3||4||4||4||6||8||9||11||12||15||18|
|3 to Em||2||3||3.5||4||5||5||6||8||10||12||14||16||20||24|
Suppose you are setting 10 point type and you need space out at the end of a line. Each 3-to-Em space replaced with two 5-to-Em spaces will use up an extra half point of space on the line. Replacing with one 4-to-Em and one 5-to-Em will use an extra point. And replacing with two 4-to-Em spaces (equivalent to an En space) will increase spacing by 1½ points.
Various foundries offer differing schemes for determining the number of characters in fonts. Many foundries provide a range of font sizes that differ among both typefaces and font height; these sizes are expressed in the number of capital ``A'' and lower case ``a'' characters (and, if figures are offered separately, the number of ``1'' characters).
The table below compares the 16A 36a fonting schemes from ATF, Barco, and The Swamp Press. The percentage numbers indicate the ratio the letter represents in either the upper or lower case alphabet.
|Upper Case||Lower Case|
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