> Actually, the modern convention of a single space is not due to saving space.† A proportional computer font is kerned in such a way that the space after a per

> Actually, the modern convention of a single space is not due to saving space.† A proportional computer font is kerned in such a way that the space after a period is wider then between words. That's not "the modern convention of a single space"; that's "a return to the original convention of wider than a normal character width spacing". Note your reference to the width of the space being 1.5em, for instance. Otherwise, what you say is true.