The Blind Spot, page 150 by Austin Hall
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Finally we went back to our chairs. We had heard nothing further. Nevertheless, we continued to keep silence, with our ears alert for anything more.
"Hush!" whispered Charlotte all of a sudden. "Did you hear that?" And she looked up toward the ceiling.
In a moment I caught the sound. It was exceedingly faint, like the distant thrumming of a zither. Only it was a single note, which did not rise and fall, although there seemed a continual variation in its volume.
Unexpectedly the other sounds came again, down under the table. This time we remained in our seats and simply listened. And presently Sir Henry, referring to the ring, made this suggestion:
"Suppose we seal it up, and see whether it inducts the sound then as well as when exposed."
This appealed to Herold very strongly; the others were agreeable; so I ran upstairs to my room and secured a small screw-top metal canister, which I knew to be airtight. It was necessary to remove the stone from the ring, in order to get it into the opening in the can. Presently this was done; and while our invisible visitor continued his scratchy little walking as before, I screwed the top of the can down as tightly as I could.
Instantly the footsteps halted.
I unscrewed the top a trifle. As instantly the stepping was resumed.
"Ah!" cried Herold. "It's a question of radioactivity, then! Remember Le Bon's experiments, Sir Henry?"
But Miss Clarke was sorely mystified by this simple matter, and herself repeated the experiments. Equally puzzled was Mme. Le Fabre. According to her theory, a spirit wouldn't mind a little thing like a metal box. Of them all, Dr. Malloy was the least disturbed; so decidedly so that General Hume eyed him quizzically.
"Fine bunch of hallucinations, doctor."
"Almost commonplace," retorted Malloy.
Presently I mentioned that the Rhamda had come from the basement on the night that Ariadne had materialised; and I showed that the only possible route into the cellar was thro