Until the advent of the typewriter, that is, when a design quirk caused typographical rules to change yet again, and the two-space rule became the industry standard. Typewriters used what’s called monospace typing, in which every letter on the keyboard had the same amount of horizontal space. The key for a lowercase “i” was just as wide as one for a capital “W,” creating an awkward amount of white space between letters, and making it hard to discern where certain words started or ended. To avoid confusion, typists would put an extra space at the end of a sentence.
For the Love of God, Stop Putting Two Spaces After a Period
John McDermott
376144

This has been debunked. Here: http://widespacer.blogspot.ca/2014/01/two-spaces-old-typists-habit.html

And here: http://widespacer.blogspot.ca/2014/01/two-spaces-old-typists-habit.html

That later website has a neat tool to visualize more or less space at the end of a sentence. I much prefer a little extra space between sentences. The articles are much more informative on the question of spacing than yours pretends to be.

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