Improvements in and connected with Micro-telephones.
Year: 1899

page_text: Date of Application, 4th Nov., 1899-Accepted, 17th Mar., 1900
COMPLETE SPECIFICATION
Improvements in and connected with Micro-telephones.
1. SIEGFRIED SCHIFF, of No. 17, Ranke Strasse, Berlin, Kingdom of Prussia,
German Empe, Merchant, do hereby declare the nature of this invention, and
in what manner the same is to be performed, to be particularly descubed and
ascertained in and by the following statement —
The present invention relates to an improvement in micro-telephones and has
for its object to provide an apparatus which easily can be manipulated and
which especially in sanitary respect 16 much more recommendable than the
apparatus used up to now
My invention will be more fully understood with reference to the accompany-
ing diawing, in which similar letters denote similar parts throughout the diffcient
views, and in which,
Figure 1 illustrates a vertical longitudinal section of my apparatus,
Figure 2 is a back view of the same
J
The micro-telephone consists of two parts, the transmitter and the hearer.
The construction of the latter is well known and it essentially consists of the
casing A within which by means of a cover B a diaphragm C can be arranged
magnet 1) of nearly ng form is mounted within this casing, said magnet upon
its extremities carrying coils E F The voice-tiansmitter consists of a similai
case G provided with a diaphragm I fixed to the case by means of the cover II
A metal sieve or net K aanged below the opening of the cover I serves to pro-
tect the diaphragm against outside influences. The microphone 18 aanged
within the casing G, and consists of a carbon-cylinder L, provided with funnel-
formed recesses L'. The carbon cylinder L itself is mounted within the metal
ng M provided with a screw thread for the purpose of being screwed into the
fiame Nalanged within the casing G These funnel-formed recesses are filled
out with gianulated carbon, especially manufactured for this purpose The
clectic connection between the voice-tiansmitter and the healer is not as
luther to attained by means of wires conducted through a hollow casing, but two
stift metal iods O and l' serving to connect the voice transmitter with the healer,
at the same time eftect the electric communication between both apparatus.
The apparatus hereby is of a form totally different to that of those which
hither to were used
This new form simplifies enormously the manipulation of such apparatus and
also in sanitary respect is advantageous. Whilst hitherto the voice transmitter
was mounted rectangular to the hearer, it was to be disposed in front of the
mouth, with my apparatus the voice transmitter might have any position owing
to it not being necessary, that the sound waves meet the transmitter vertically.
As can be learned from Figure 2, the rail P consists of two parts in such a
manner that the communication between both parts only is effected when the
heaner 18 taken in hand and the pusher Qis pressed downwards, the latter abuts
against a stop R fixed to an elastic rail 8, which with its free extremity is con-
nected to the upper half of the contact 1ail by means of a screw T. When the
pusher Q18 pressed downwards, the elastic connection rail S effects the electrio

page_text: connection of both halves of the rail P. The pusher Q having a bent at its uppe
extremity is arranged to the handle part in a manner as to be easily pressed
down Two caoutchouc plates V are provided for covering the switch-arrange-
ment in the handle and for rendering easier the manipulation of the whole
apparatus.
The connection of this micro-telephone with the cucuit can be obtained by a
plug W applied to a switch m the oidinary manner Hereby one of the wies is
connected to the clamp 1, which is in contact with the second clamp 2 The
latter is guided along the inner wall of the casing and is in contact with the
diaphragm J From here the cucuit flows through the frame N, from there
to the clamp 3, then into the ail O through the coils E and F of the heater,
back through the rail P to the clamp 4, where it passes through the second we
provided within the cord X. to which is fixed the plug W
The back side of
the voice transmitter is provided with a button %, which when pushed inwards, 18
in connection with the clamp 1, the latter influencing the elastic rail Y pushes
the same downwards onto the fixed 1ail Y' which then eftects the connection with
the clamp 4 This connection is necessary for calling another party By meaus
of a ng 5 suitably attached to the heaie the apparatus might be easily sub-
pended
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim 18. —
An improved micro-telephone, consisting of a voice-transmitter and a heater
connected together by two metal iods, forming at the same time the electe
connection, the transmitter being provided with a microphone and arranged in
straight line with the hearer, for the purpose and substantially as described.
Dated this 3rd day of November 1899
F BOSSHARDT & Co,
4, Corporation Street, Manchester,
Agents to Applicant