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Updated: May 29, 2025
I don't know that it has a name, although it might be called a 'rayograph. You see, all you have to do is to lay the thing you wish to study flat here, and the system of mirrors and lenses reflects it and enlarges it on a sheet." He had lowered a rolled-up sheet of white at the opposite end of the room, and there, in huge characters, stood forth plainly the writing of the note.
You'd never see that in the original, but when it is enlarged you see how plainly visible the tremors of the hand become? Try as you may, you can't conceal them. The fact is that the writer of this note suffered from a form of heart disease. Now let us look at the copy that Collins made at the Novella." He placed the copy on the table of the rayograph.
"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."
"This letter," he resumed, studying the enlargement carefully, "is likely to prove crucial. It's very queer. Collins says he didn't write it, and if he did he surely is a wonder at disguising his hand. I doubt if any one could disguise what the rayograph shows. Now, for instance, this is very important. Do you see how those strokes of the long letters are well, wobbly?
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.
For several minutes, he occupied himself with the adjustment of this machine, switching the light off and on and focussing the lenses. Then he took the letter to Miss Winslow, laid it flat on the machine, switched on the light and immediately on the sheet appeared a very enlarged copy of the writing. "This is what has been called a rayograph by a detective of my acquaintance," explained Garrick.
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