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Updated: May 7, 2025
Craig had dropped the two ear-pieces and was gazing intently at the Osram lamp in the ceiling. Was he, too, crazy? "Here, Mr. Brixton, take these two receivers of the detectaphone," said Kennedy. "Tell me whether you can recognise the voice." "Why, it's familiar," he remarked slowly. "I can't place it, but I've heard it before. Where is it? What is this thing, anyhow?"
"It is an Osram lamp of about a hundred candlepower, I should judge," he observed. Apparently he had satisfied himself that there was nothing concealed in the light itself. Laboriously, with such assistance as the memory of Mr. Brixton could give, he began tracing out the course of both the electric light and telephone wires that led down into the den.
Kennedy therefore began at the other end, and having found the points in the huge cellar of the house where the main trunk and feed wires entered, he began a systematic search in that direction. A separate line led, apparently, to the den, and where this line feeding the Osram lamp passed near a dark storeroom in a corner Craig examined more closely than ever.
The things needed are an arc-lamp, an impedance coil, or small transformer- coil, a rheostat, and a source of energy. The alternating current is not adapted to reproduce speech, but the ordinary direct current is. Of course, the theory isn't half as simple as the apparatus I have described." He had unscrewed the Osram lamp. The talking ceased immediately.
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