But, it is there, to the eye of the expert, even in
incipient cases.
"In short," he continued, engrossed in his subject, "what really
happens is that the pen acts as a sort of sphygmograph,
registering the pulsations. I think you can readily see that when
the writing is thrown on a screen, enlarged by the rayograph, the
tremors of the pen are quite apparent."
I studied the writing, following his pointer as it went over the
lines and I began to understand vaguely what he was driving at.
"The writer of that blackmailing letter," continued Garrick, "as I
have discovered both by hastily running over it with a tooth-pick
and, more accurately, by enlarging and studying it with the
rayograph, is suffering from a peculiar conjunction of nervous
trouble and disease of the heart which is latent and has not yet
manifested itself, even to him."
Garrick studied the writing, then added, thoughtfully, "if I knew
him, I might warn him in time."
"A fellow like that needs only the warning of a club or of a good
pair of fists," growled Warrington, impatiently.
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