The
ticking sank almost into silence as the receiving apparatus was
held in the shadow of the office table, and leaped into a lively
rattle again when I brought it near an electric-light bulb. I
blindfolded myself and moved a piece of blotting paper between the
receiver and the light. I could actually hear the grating of the
shadow, yes, I heard the shadow pass. At night, too, I have found
that it is even affected by the light of the stars."
He glanced out of the window in the direction of Warrington's,
which we could not see, however, since it was around an angle of
the building.
"See," he went on, "the moon is rising, and in a few minutes, I
calculate, it will shine right into that room over there on
Seventy-second Street. By using this optophone, I could tell you
the moment it does. Try the thing, yourself, Tom."
I did so. Though my ear was untrained to distinguish between
sounds I could hear just the faintest noise.
Suddenly there came a weird racket. Hastily I looked up at Garrick
in surprise.
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