The Tupelo journal., 1904-09-02
St Louis Letter.

Editor Journal The next
building we shall take up in our
rounds is Electricity, situated
Just south of Varied Industries,
and east of Machinery Hall.
In this, we notice particularly
the almost absence of up-to-date
electrical machinery in the foreign
exhibits, emphasizing the fact
that America is the leader in such
matters. Germany and England
compare most f~avorably with US
among all the countries represent
ed, but these two must acknowledge
that they are not so progressive.
Even little Japan has a consider
able amount of space here, but ii
seems to me she could have done
on less, though she has made
much progress along electrical
lines since she was Americanized.
She has only learned to manu-
facture what we originated, and
has not advanced into new inven-
tons. Entering the west side of
the building zone is surrounded by
whirling, huzzing, fans, motors,
dynamos and dazzled at the ex-
treme brightness of the mercury
vapor electric lights, and other
numerous kinds of lights present.
The mercury light is secured by
passing an electric current through
mercury or quick silver placed in
a glass tube. The heat vaporizes
the mercury forming the most
brilliant light seen here. In one
part Of the building is a section
cut in the floor to show the
method of %disposing of under
ground cables for electric light,
telephone and telegraph wires.
This is instructive to people not
living in cities where such ar
rangements are resorted to. One
can see in this building, also, the
telantograph, an instrument for
writing at distances on the same
principle as t%elegraphy. All one
has to do is to place the pencil or
pen in a small loop provided for
the purpose and begin work. Oyer
on the wall some ten feet away he
sees the instrument recording ex-
actly his message in the same style
of penmanship. Instruments for
multiple telegraphy are shown
here, several thousands words be-
ing sent a minute, so it is said.
Wireless telegraphy is demonstrate
ed here, too; both systems, the
American De Forest, endorsed by
our government, and the Marconi.
There are several stations OF the
former on the grounds, one a
tower 800 feet high. In the
Electricity building there is a
station of American DE Forest
Telegraphy. that one ian see and
examine. If the telephone reveiv
err is placed to the a the dots
and dashes that flash through
space are distinctly audible, while
at the tall tower, the Chicago can
be heard a hundred yards off.
Wireless telegraphy is possibly
on the principle of the Hertzan
moves, named for the scientist
Hertz, who discovered that when
of electricity passed
through the atmosphere as between
the poles of an induction coil,
waves were made, having
the same velocity as light. He
further found that these went off
in all directions but could be re.
in any desired direction.
Experiments were carried further
and it developed that these waves
could also be intercepted at a DIS
lance, conducted through special
and made to operate the
telegraph instrument. That is
what lis being done today. The
difference between the two sys-
TENS is mainly q difference be-
Tween the character of the instru-
ments employed.
The process of manufacture Of
light bulbs is shown here.
the rough glass bulb that
mas not been closed, to the finish
ID product. This will prove inter
to all familiar with the
oulb. Finally, the University of
Mississippi has on exhibition an
plate machine, made
some years ago, and Of interest in
The scientific world, on account Of
is being J among the first of its
lind made. Its picture forms the
piece Of a very valuable
on electricity, published
,ome wears ago, and instructors
be familiar with it.
G. il. DABBS.