The Cook County herald. [volume] (Grand Marais, Minn.) 1893-1909, 1900-09-29
ffi1lapd
SIS Nj
T1a-Biss - News Tor scaa1Ina-
viAns. & VI
Two Danes Cieyerly Com fIne til.
Telephone and PhonograpH.
& HOLDS THE MESSAGE,


Telephone and 5FhonograpI.ss
II BY com ining the telephone and pho
nograph a most useful and interesting
mechanism has been invented by two
Danes, Valdemar Poulsen and p O..
Peterson. The device has been taken
up by the highest authorities Of the
German postal service, and the expert
ments of the inventors have been fol-.
lowed closely by apparatus constructed
by German manufacturers of tele-t
graphic appliances. By simply turning,
a switch, messages received by this in
strument, which has been named the
telerhonograph, are recorded, and may
be repeated almost Indefinitely. BY its
use the much-Worried telephone sub
scriber receives 10 per cent more value
from the instrument, and, if he so de-
sires, can dispense entirely with the
non-ever-ready Office boy who answers
the "hello!" over the line.
You may be in the office or out dead
or alive, your patrons will be courte-
ously treated at any hour of the day or
night If you want to know anything
that has been '"phoned in," just press
a button; and all messages are rede-
nothing will ever be wanted again, you
turn another switch, and the "stuff's
off" and your instrument is ready for
another batch of messages received
To the Impractical eye this invention
simply appears to consist of a magnet
wrapped around by a few loops Of
wire, and a wire of steel wound on a
barrel actuated by clock-work, to make
the barrel revolves, the whole inserted
in the circuit of the telephone, ard
there you are. The principle, as ap-
piled in this contrivance, is equally
simple. The residual magnetism con-
tanned in all iron is more or less af-
fected by the proximity of the magnet.
Corresponding to the polarity of the
residual magnetism in the plate of iron
. and that of the magnet, the density
along the line drawn by the magnet
will be distinctly greater or less than
! anywhere else. A steel wire wound in
grooves on a cylindrical drum or bar
rel, is under the influence of small
electro magnet, which can be made to
glide along the entire length of the
wire by turning the barrel and causing
the magnet to move sideways in the
same manner. The core of this elect
ro-magnet is an iron wire one-twenty-
fifth OF an inch in diameter, arranged
so that the steel wire on the barrel
glides between its two ends. When the
electromagnetic is excited by constant
current and the barrel set in motion by
the clock-work, the wire will be equal
~ magnetized from one end to the
other. But with an electro-magnet
which is excited by the sounds through
a telephone, the polarity of this magnet
Is constantly changing. The residual
magnetism of the steel barrel also va
res, being either made stronger or 4
weaker. And, i as a. result, the steer
wire contains varying degrees OF mag
netism along its length. Among the
laws OF induction lies this, that any al
teration in magnetism near loop Of
wire induces an electrical current in
the latter, provided it makes a closed
circuit. The steel wire now is enabled
to induce in the coils of the magnet a
current exactly corresponding in alter
nation In the original current, and this
is used to make the photographic rec
ord. Messages have; been repeated
1000 times and still not show any signs
Of weakening, gaining, rather than los
ing, in clearness, over the original. The
instrument is to be manufactured in
three types: The first, for conversa-
ton lasting one minute; the second re-
cords a ffteen-minute talk; the third
for long addresses or newspaper dis
patches, the principle in all being the
same. as.:1 =. ~ IL 81 ~