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There is a distinct possibility that we are dealing with TWO MANUAL TYPEWRITERS. Only the very best typists can provide perfectly matched strikes in that case.

It would take a really sloppy typist to cause a different typeface to appear in one word from one typewriter wouldn't it? Or are we back to the idea that they switched typewriters in the middle of a word?

Take a look at the "aaaaaa" selection. He is saying that he found all those different degrees of impression from one typewriter in a single line.

Let me suggest something to you that will go down easier if you just relax ~ the guy with 50 years experience in typography has 50 years experience in POWERED COMPOSITION.

The lineotype was invented in 1884 ~ and that was the beginning of the end for irregular handset type. From that time on hot lead was the game ~ and made modern daily newspapers possible.

Manual typewriters have always suffered from the fact that there's no precision control on the hammers. You get what you hit. You press it real hard and sharp you can cut the paper. You press it too light and shallow and you might not leave a smudge.

Electric typewriters have been in general use since the mid 1930s. They provide smooth, even typing where every keystroke is identical to every other keystroke.

We have an earlier thread where that topic is discussed over hundreds of posts.

I grew up with a manual typewriter and used it in college to put out our dormitory newsletter.