It consists of fourteen lines, or ridges. With the
micrometer," and he raised the lid of a little leather box which stood
on the table, took out an instrument of polished steel and applied it
to one of the photographs, "we get the angle of these ridges. See how
I adjust it," and I watched him, as, with a delicate thumbscrew, he
made the needle-like points of the finder coincide with the outside
lines of the whorl. "Now here is a photograph from the other robe,
also showing the thumb," and he applied the machine carefully to it.
"It also is a double whorl of fourteen lines, and you see the angles
are the same. And here is the print of the right thumb which your
client made for me." He applied the micrometer and drew back that I
might see for myself.
"But these photographs are enlarged," I objected.
"That makes no difference. Enlargement does not alter the angles.
Here are the other prints."
He compared them one by one, in the same manner. When he had finished,
there was no escaping the conviction that they had been made by the
same hand--that is, unless one denied the theory of finger-print
identification altogether, and that, I knew, would be absurd.
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