Improved Portable Telephone Apparatus.
Year: 1896

page_text: Date of Application, 21st Oct., 1896-Accepted, 28th Nov., 1895
COMILELE DE BOLL
[Communicated from abroad by the Firm of TÖPFFER, AND SCHÄDEL, Berlin, in the
German Empire, Electrical Engineers.]
Improved Portable Telephone Apparatus.
I, JOSEPH KANDT, of 12, Shaftesbury Avenue in the County of London,
Manufacturer, do hereby declare the nature of this invention and in what manner
the same is to be performed, to be particularly described and ascertained in and by
the following statement
-
My application for Letters Patent has reference to
apparatus.
an improved telephone
By means of this invention I am enabled to produce a complete receiving and
transmitting apparatus with push for the call bell in a most convenient and elegant
form and of a minimum size and weight, thus ensuring portability, without in any
way sacrificing its efficiency in use.
The apparatus when closed and out of use resembles in outward shape a small pear.
The lower part fits into the upper one, and is also attached thereto by a flexible cable
carrying the connecting wires.
The invention is illustrated in the accompanying drawings in which
Figure 1 is a view of the apparatus when closed and out of operation.
Figure 2 is a view of the same with the transmitter detached and shewing its
upper surface.
Figure 3 is a vertical section of Figure 1.
Figure 4 is a view of the interior of the receiver after removal of the diaphragm.
The receiver T is connected to the transmitter M by means of the cable d, and to
the circuit by means of the cable d¹. A horseshoe magnet e and spools fare mounted
on the plate g fixed to the casing. The transmitter or microphone M is formed of a
charcoal diaphragm h, corrugated carbon disc i and loose granular carbon k.
When the apparatus is closed and out of use the little push c is pressed in by the
rim of the microphone casing where it fits on the receiver, whereby the spring
contact c is pressed against the other contact e" (Figure 4). By means of this
arrangement the call bell is cut in to the circuit and the telephone apparatus cut
out, so that the operator can be rung up from another station; this apparatus is
mounted as shewn in the drawings within the receiver. When on the other hand the
two parts are separated as for instance for the purpose of receiving or transmitting a
message, the push c is released, and the spring contacts revert to the position shown
in the drawing whereby the bell circuit is interrupted and the telephone circuit
completed. The switch key with its push a for operating the signalling apparatus
when it is desired to call another station is located in the hollow space below the
microphone in the part M.
The apparatus may obviously be used
mechanism or be adapted for use as a long
induction coil in the well known manner.
apparatus to enable it to be used as a portable
line.
for short distances without additional
distance telephone by the addition of an
It may also be provided with plugging
station for connection with a telephone

page_text: Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
The combined portable telephone apparatus either with or without the switch key a
substantially as above described and shewn in the accompanying drawings.
Dated this 21st day of October 1896.
W. P. THOMPSON & Co.,
322, High Holborn, London, W.C., Patent Agents for the Applicant.