Telephonic Apparatus for Transmitting and Receiving Messages Simultaneously to and from Several Distant Stations.
Year: 1899

page_text: Date of Application, 19th Aug., 1899-Accepted, 7th Oct., 1899
Telephonic Apparatus for Transmitting and Receiving Messages
Simultaneously to and from Several Distant Stations.
We, SIEMENS, BROTHERS & Co., LIMITED, of 12, Queen Anne's Gate, West-
minster, in the County of London, Electrical Engineers, do hereby declare the
nature of this invention (as communicated to us from abroad by Siemens &
Halsko Aktien Gesellschaft, of Markgrafen Strasse No. 94, Berlin, Germany,
Electrical Engineers,) and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement:-
This invention relates to a combination of telephonic apparatus whereby one
and the same message can be transmitted from a single sending instrument at
a telephone station to several separate telephone receiving instruments at distant
stations, while messages can be transmitted from any one of these stations to
a single receiving instrument at the first named station.
For this purpose there are firstly combined with a single mouth piece at the
said station a series of microphones so arranged round the same that the speech
is transmitted simultaneously to all the microphones, these being each con-
nected by a circuit with the receiving instrument at a distant station, and secondly
there are combined with a single receiving membrane at the said station a series
of receiving instruments each of which is connected to the transmitter at a dis-
tant station, and which are so arranged round the said membrane that the speech
transmitted from any one of the distant stations is transmitted to the membrane.
As shewn by way of example on the accompanying diagrammatic drawing, A
represents a telephone station, in which, firstly a number of telephonic receivers T
are arranged round a central receiving membrane B, being accoustically con-
nected therewith in the known manner by a series of tubes C, and secondly a
number of microphone transmitters M are arranged round a central mouth
piece B being accoustically connected therewith by tubes C. Each telephone T,
with its corresponding microphone M is connected to the receiver and trans-
mitter of an ordinary telephone apparatus Il II &c., at a distant station, the
circuits of only one telephone and its microphone being shewn on the drawing
for the sake of clearness; the arrangement of such circuits is otherwise of the
ordinary kind and requires no further description. By the above described
arrangement the advantage is gained that from the station A communications
can be transmitted simultaneously to all the stations I II &c. without any weaken-
ing of the transmitted sounds.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is:-
In telephonic apparatus, the combination of a series of telephone receivers
grouped in the known manner round a single receiving membrane with which
they are all accoustically connected, and a series of microphone transmitters
grouped round a single mouth-piece with which they are all accoustically con-

page_text: nected, each such telephone receiver with a corresponding microphone trans-
mitter being connected separately to a telephone apparatus at a distant station,
so that by means of the said combined apparatus communications can be simul-
taneously transmitted to all the distant stations connected therewith, substan-
tially as described.
1
1
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1000