explained in answer to my inquiry. "It is absolutely balanced as
to resistance, number of turns, and everything. I shall run this
third line from the coil into Brixton's den, and then, if you
like, you can accompany me on a little excursion down to the
village where I am going to install another similar coil between
the two lines at the local telephone central station opposite the
railroad."

Brixton met us about eight o'clock that night in his now renovated
den. Apparently, even the little change from uncertainty to
certainty so far had had a tonic effect on him. I had, however,
almost given up the illusion that it was possible for us to be
even in the den without being watched by an unseen eye. It seemed
to me that to one who could conceive of talking through an
incandescent lamp seeing, even through steel and masonry, was not
impossible.

Kennedy had brought with him a rectangular box of oak, in one of
the large faces of which were two square boles. As he replaced the
black camera-like box of the detectaphone with this oak box he
remarked: "This is an intercommunicating telephone arrangement of
the detectaphone. You see, it is more sensitive than anything of
the sort ever made before. The arrangement of these little square
holes is such as to make them act as horns or magnifiers of a
double receiver. We can all hear at once what is going on by using
this machine."

We had not been waiting long before a peculiar noise seemed to
issue from the detectaphone. It was as though a door had been
opened and shut hastily. Some one had evidently entered the