Michael Everson scripsit:
The typing habit was designed to assist typesetters in reading the manuscript as they were setting type.
Either this says that double-spacing after a sentence improves the readability of monospaced documents, or I misunderstand you entirely.
It assists the printer. In such a context it has a specific utility.
After all, typists are (or were) taught to do so in all sorts of documents, including those like business letters that were not to be typeset.
Typists were taught to do it generally, but the origin of the practice is to assist the typesetters.
--
Michael Everson * * Everson Typography * * http://www.evertype.com
