Well, from my long experience, I'm 73 years old, the two spaces applied with use of non-proportional typewriters of yesteryear. Such went to one space when DTP came into popular being and proportional spacing for type in word-processors was used for most bodies of text. Looking over typeset books of long ago, even then we could see the single-space between sentences, really an em-space or en-space.
A well-coded DTP problem should have no problems with double spacing between sentences and line-break wraps. Bart Alberti wrote: >I have been told vehemently that TWO spaces should be put between sentences >and just as insistently that such is old hat. If it affects appearance then >it counts as a problem as it would since the line breaks inappropriately. > >Bart Alberti > >
