"We do all our correspondence with this machine at the office,
and no doubt it is a little worn," our visitor answered, glancing
keenly at Holmes with his bright little eyes.
"And now I will show you what is really a very interesting study,
Mr. Windibank," Holmes continued. "I think of writing another
little monograph some of these days on the typewriter and its
relation to crime. It is a subject to which I have devoted some
little attention. I have here four letters which purport to come
from the missing man. They are all typewritten. In each case, not
only are the 'e's' slurred and the 'r's' tailless, but you will
observe, if you care to use my magnifying lens, that the fourteen
other characteristics to which I have alluded are there as well."
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