results.
I now had a substance resembling glass in appearance, though vastly
different in composition, which I made into a film, extremely thin and
highly sensitive to vibrations. Running through this film were slender
wires made of various metals, about one inch apart, which served not
only to give rigidity to the film, but also to conduct a current of
electricity through it, engendering a high state of atomic agitation.
The current was controlled by a small switch placed in a heavy box-like
frame, which bounded the film on its four sides and contained the
batteries, coils, etc. To this were attached four legs, supporting it
about the height of an ordinary table from the floor. The whole device
measured about seven feet square.

This film substance contained certain elements which I had found to be
necessary to secure the desired intensity of agitation. It had taken me
almost a month to secure the fine quality I desired, and I looked
forward to the test with the feeling that results would prove that I was
nearing the goal, if I had not actually attained it.

At last the day arrived when my device was ready for the test. I had
worked all the afternoon giving the finishing touches and it had grown
dusk without my realizing it. But everything was now ready, and moving
the switch, I turned the current of electricity through the composition.
Just as I was about to begin my test, I noticed what appeared to be a
faint shadow of a man move across the surface of the film. My first
thought was that someone had entered the room without my knowledge, and
his figure had been reflected on the surface of the film, which was
highly glazed, but a glance around the room assured me that this
explanation was untenable. Moreover, I found, upon further
investigation, that the film was lying in such a position that it would
be impossible to reflect any person in the room. I then examined the
skylight, only to find that, owing to the sharp inclination of the roof,
it would be an utter impossibility for anyone to reach it from the
outside without the aid of a ladder. I investigated this source further,
thinking to find the reflection on the film to be from some street in
the city below, but on account of the extent of the roof, no street was
visible from the skylight.

Completely baffled, I descended into the room again and turned on the
current. Immediately the shadow appeared on the film, and this time, in
consequence of the room now bei