ich, although it would only give a small spark, would twist the
arms and clutch the hands of a man so that he could not let go of the
apparatus. One day we went down to the round-house of the Cincinnati &
Indianapolis Railroad and connected up the long wash-tank in the room
with the coil, one electrode being connected to earth. Above this
wash-room was a flat roof. We bored a hole through the roof, and could
see the men as they came in. The first man as he entered dipped his
hands in the water. The floor being wet he formed a circuit, and up went
his hands. He tried it the second time, with the same result. He then
stood against the wall with a puzzled expression. We surmised that
he was waiting for somebody else to come in, which occurred shortly
after--with the same result. Then they went out, and the place was soon
crowded, and there was considerable excitement. Various theories
were broached to explain the curious phenomenon. We enjoyed the sport
immensely." It must be remembered that this was over forty years ago,
when there was no popular instruction in electricity, and when its
possibilities for practical joking were known to very few. To-day such a
crowd of working-men would be sure to include at least one student of
a night school or correspondence course who would explain the mystery
offhand.

Note has been made of the presence of Ellsworth in the Cincinnati
office, and his service with the Confederate guerrilla Morgan, for whom
he tapped Federal wires, read military messages, sent false ones, and
did serious mischief generally. It is well known that one operator can
recognize another by the way in which he makes his signals--it is his
style of handwriting. Ellsworth possessed in a remarkable degree the
skill of imitating these peculiarities, and thus he deceived the Union
operators easily. Edison says that while apparently a quiet man in
bearing, Ellsworth, after the excitement of fighting, found the tameness
of a telegraph office obnoxious, and that he became a bad "gun man"
in the Panhandle of Texas, where he was killed. "We soon became
acquainted," says Edison of this period in Cincinnati, "and he wanted me
to invent a secret method of sending despatches so that an intermediate
operator could not tap the wire and understand it. He said that if it
could be accomplished, he could sell it to the Government for a large
sum of money. This suited me, and I started in and succeeded in making
such an instrument, w