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Units and Letterspacing

36-POINT EM

36-POINT EM D VIDED INTO 18 UNITS

72-POINT EM DIVIDED INTO 18 UNITS

The unit is to phototypesetting what the point is to linecasting. In other words, an understanding of the unit is essential to the use and control of letterspacing in phototypesetting. (9 POINT ITC SOUVENIR LIGHT SET WITH "PLUS S UNIT" LETTERSPACING)

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The unit is based on the em, which is the square of the type size (a 36-point em is 36 points square ). The em is subdivided into smaller sections called "units:' The number of units to the em varies from one manufacturer to another, but for this discussion we will use one of the most common divisions â&#x20AC;&#x201D;18 units to the em. (9 POINT ITC SOUVENIR LIGHT SET WITH "NORMAL' LETTERSPACING)

The size of the unit, like the size of the em, varies from one type size to another. For example, in an 18 unit to the em system, a unit of 72-point type is larger than a unit of 36-point type. A simple method of determining the size of a unit in points is to think of it as 1/18 of the type size: a unit of 72-point type would be 4 points; 36-point type, 2 points; 18-point type, 1 point; and 9-point type, 1/2 point. (9 POINT ITC SOUVENIR LIGHT SET WITH "MINUS S UNIT" LETTERSPACING)

When specifying phototype with letterspacing or minus letterspacing, always indicate the amount of spacing in units, or in some eases 1/2 units. Needless to say there is a limit to how much space can be tel roved before the letters start to touch or overlap. NOTE: when experimenting with letterspacing, it is always a good policy to haw a type sample set before proceeding with the entire job. (9 POINT ITC SOUVENIR LIGHT SET WITH "MINUS 1 UNIT' LETTERSPACING) IA. BaUn/40

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