"Almost any one would have
used a machine. That would have been due to the erroneous idea
that typewriting cannot be detected. The fact is that the
typewriter is perhaps a worse means of concealing identity than is
disguised handwriting, especially printing like this. It doesn't
afford the effective protection to the criminal that one supposes.
On the contrary, the typewriting of such a note may be the direct
means by which it can be traced to its source. We can determine
what kind of machine it was done with, then what particular
machine was used can be identified."
He paused and indicated a number of little instruments which he
had taken from a drawer and laid on the table, as he tore off a
bit of the corner of the sheet of paper and examined it.
"There is one thing I can do now, though," he continued. "I can
study the quality of the paper in this sheet. If it were only torn
like those warnings we have already received, it might perhaps be
mated with another piece as accurately as if the act had been
performed before our eyes."
He picked up a little instrument with a small curved arm and a
finely threaded screw that brought the two flat surfaces of the
arm and the end of the screw together.
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