Re: "em" should be horizontal, "ex" vertical
At 11:12a +0100 08/11/97, Clive Bruton wrote:
> Peter Flynn wrote at 11/8/97 10:59 am
> >> While that's a good definition, typesetting practice /never/ uses "em"
> >> as vertical measurement; an em is a horizontal measurement only, and an
> >> "ex" is the vertical measurement. This makes measurements based on
> >> fonts size work with compressed an/or fat fonts.
> >This is incorrect: pica ems are used for page depth and line spacing
> >almost universally in the Anglo-American world. When did you last see
> >a comp's spec specify print-area height in "ex"s?
> Correct, the definition of an "em" is a *square* of any given body size,
> ie 9pt*9pt, 24pt*24pt, 72pt*72pt are all ems.
And here I thought an em was a square the width of an uppercase "M".
> The correct term for a 12pt
> em is a *pica* em as pointed out, an em is a relative unit.
I've never heard of a "pica em" -- only just "pica" (1/6 of an inch), and
picas are indeed used for both horizontal and vertical.
Walter Ian Kaye <boo_at_best*com> Programmer - Excel, AppleScript,
Mountain View, CA ProTERM, FoxPro, HTML
http://www.natural-innovations.com/ Musician - Guitarist, Songwriter