The Savannah morning news. (Savannah, Ga.) 1900-current, 1900-08-12
DANIEL HOGAN.
The corner Broughton and Barnard SITS.

of the magnet. the density along the line
drawn by the magnet will be distinctly
greater or less than anywhere else.
Poulsens invention is based on this mu-
liability of residual magnetism. A steel
wire. wound In grooves on cylindrical
drum or barrel, is under the influence OF
a small electromagnetic which can be made
10 glide along the entire length of the wire
by turning the barrel and causing the
magnet 10 move sideways correspondinsly.
The core of this electro magnet. is an iron
wire one-twentyLhfth OF an inch in diam
eter arranged so that the steel wire on
the barrel glides between its two ends
Wher the electro-magnet is excited by
constant current, and the barrel set in mo-
tion by the clockwork, as shown in dia-
gram. switch position (a), the wire will be
equally magnetized from one end to the
other, /. e., every section will contain the
same amount of residual magnetism.
When, however as is the case with an
electro magnet which is excited by the
current of a telephone, the polarity of the
inscrIber as the magnet Is sometimes
called, is continually changing, the resid-
ual ma gnetism OF the recorder 0he steel
wire on the barreD also varies, being eth
er weakened or strengthened. The result
Is that the steel wire contains continually
varying degrees Of magnetism along Its
entire length. Now Ii is one of the first
laws of induction that any change in mag
netism near a loop of wire will induce an
electric Gun rent In the latter, provided II
be a closed circuit. To make a long yet
very siInple) story short, the steel wire
is now able TO induce in the coils OF the
magnet cur rent exactly corresponding
INDIGNATION to the original current, ana
wren therefore the switch is given the third
position (c) and the clockwork set in
motion the sounds telephoned in the first
place are repeated. message was re-
peated 300 times without showing the
slightest traces of weakening, so that we
may Justly say there IL almost no limit
to the number OF repetitione. Moreover,
the repeated sound If stronger than the
original, which is quite natural, when we
consider that currents in one direction
strengthen the magnetism in the recording
wire, while opposite currents weaken H.
The effect Is thus doubled. When the
wire IS filed, oil traces of the conversa-
ton arc obliterated by setting the switch
in position (a) again and remagnetizing
wire. In practice the construction of the
apparatus differs considerably from TINT
shown in the diagram. which merely
serves to explain the principle Of the in
vention.
Some Applications.
There are three representative types In
"a
an inch in diameter is wound on a bar
rel ten inches long by five-oneIhalf inches
in diameter. This apparatus is good for
conversations lasting one minute. The
second type will take down conversations
lasting ten to fifteen minutes. The re-
corder in this case Is n steel band oDe-
sixth OF an inch wide and one four hun
dredth OF an inch thick which is wound
from one reel to another like the paper
aftfa m frA fCFer La
Intended as sender for telephone news
agencies. A short steel band one and
one-half inches broad IL stretched over
two rollers After passing under the
inscribing magnet q practically unlimited
number OF electromagnetic are Influenced
by the variations in the magnetism Of
the band. each of these receiving magnets
transmits the same message 10 the sub
scriber attached. who can either take
or keep a record. Finally the
band passes an erasing magnet.
where the message Is obliterated
and the band prepared for
new message, or a continuation Of Abe
same one. The Importance OF this form
of the inyeution consists In transmitting
news 400 bulky 20 telegraph, and yet inn
portant to many such as commercial in
telligence stock reports, war news--in
feet all the matter with which our daily
papers are filled. BY using this inven-
ton, Offices could be established from
which all the leading business houses IN
a city could be kept continuously supplied
al very small cost with The state of mar
kets. stocks and affairs in general In
country. such as the United States, the
use Of the multiplying telephonograph
would be valuable at election times,
spreading ballot news I'd the many hum
dred- thousands anxiously awaiting re-
suits. In all branches OF civil and mill
tary service the invention In all its forms
will be Of much Importance, The most
rapid transmission OF general orders 90
a number Of men. scattered over q large
complex Of buildings and IN many offices,
can undoubtedly be obtained by the null
tiplyIng telcphenograph and when the re-
corder Is also used. mistakes are prac-
tcaliy Impossible.
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