"I removed the other hairs, and the seals. Then I looked up the chimney.
It went up straight, and I could see blue sky at the top. It was a big,
open flue, and free from any suggestion of hiding places, or corners.
Yet, of course, I did not trust to any such casual examination, and after
breakfast, I put on my overalls, and climbed to the very top, sounding
all the way; but I found nothing.
"Then I came down, and went over the whole of the room--floor, ceiling,
and walls, mapping them out in six-inch squares, and sounding with both
hammer and probe. But there was nothing abnormal.
"Afterward, I made a three-weeks search of the whole castle, in the same
thorough way; but found nothing. I went even further, then; for at night,
when the whistling commenced, I made a microphone test. You see, if the
whistling were mechanically produced, this test would have made evident
to me the working of the machinery, if there were any such concealed
within the walls. It certainly was an up-to-date method of examination,
as you must allow.
"Of course, I did not think that any of Tassoc's rivals had fixed up any
mechanical contrivance; but I thought it just possible that there had
been some such thing for producing the whistling, made away back in the
years, perhaps with the intention of giving the room a reputation that
would ensure its being free of inquisitive folk. You see what I mean?
Well, of course, it was just possible, if this were the case, that
someone knew the secret of the machinery, and was utilizing the knowledge
to play this devil of a prank on Tassoc.
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