Miss Keating wrote:
No letterpress compositor would employ an en quad as an interword
space, except possibly when justifying.
A standard job case contains, along with the various quads, typemetal
spaces in 3 sizes: 3-to-the-em, 4-to-the-em,
and 5-to-the-em. There are also "thin" spaces, not proportional to the
font size: "brass" at 1 point, "copper" at 1/2 point.
These spacings are often written as 3/em, &c., but are pronounced as
fully written out, to avoid confusion with the 3em and suchlike quads.
I wish I had one of those old typesetting books handy, that I used to
read. They seem a bit scarce now. ;-)
One thing I noticed in that article about the California job case. It
says 'except for the "J" and "U", moved to the lowest line to help avoid
confusing them with "I" and "V" respectively'. The way I learned it,
from those books, was the J and U were added to the alphabet after the
type case was invented and so placed after Z.
It's been over 40 years since I've done any typesetting.
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