Several times we
walked past the house, but it was not until nightfall that he
considered it wise to make the recovery. Again we slipped silently
up the terraces. It was the work of only a moment to cut the
wires, and in triumph Craig bore off the precious oak box and its
batteries.
He said little on our journey back to the city, but the moment we
had reached the laboratory he set the box on a table with an
attachment which seemed to be controlled by pedals operated by the
feet.
"Walter," he explained, holding what looked like an earpiece in
his hand, "this is another of those new little instruments that
scientific detectives to-day are using. A poet might write a
clever little verse en-titled, 'The telegraphone'll get you, if
you don't watch out.' This is the latest improved telegraphone, a
little electromagnetic wizard in a box, which we detectives are
now using to take down and 'can' telephone conversations and other
records. It is based on an entirely new principle in every way
different from the phonograph.
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