IMPROVEMENTS IN TELEPHONES
Year: 1885

page_text: I KAZIMIR STANISLAS DEMBINSKI Officer in the Belgian Army, and resident of
Brussels in the Kingdom of Belgium do hereby declare the nature of the said
invention for "IMPROVEMENTS IN TELEPHONES," 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 another kind of telephone than that referred to in the
specification annexed to Letters Patent No 3324 of 1884, and is represented in the
annexed drawings, in which:
Figure 3 is a longitudinal section of the apparatus passing through the magnets
and the centre of the lid.
Figure 4 is a plan view the lid being off.
Figure 5 is a transversal section through the centre of the apparatus, the lid
being off, and
Figure 6 is a view beneath the lid.
This telephone consists of a wooden rectangular box A in which three horse shoe
magnets B are placed in such a way that their extremities cross or overlap,
preferably about twenty millimetres as represented Figure 3. These magnets are kept
in place by means of wooden blocks ✗, screws and washers D. Inside the horse shoe
magnets and against the crossed or overlapping parts, two pieces of soft iron E are
fixed by two screws (see Figures 3 and 5), bent at right angle over the upper
magnet and supporting two wooden bobbins F round each of which in the same
direction is coiled a fine wire. The lid I supports a wire wound round of wood J
over which is a brass ring K bearing two vertical rods Z the lower part of which
rests upon the pressure screws M M. Two other pressure screws LL (Figure 6)
serve jointly with the two screws M M to regulate the warding off of the dia-
phragm N to the coils. On the wire wound part of the round J is screwed a
wooden lid O bearing a diaphragm N in tin plate or ferrotype. The central part
of this lid is perforated and bears a brass wire wound ring P serving to support &
mouth piece, a funnel form ear trumpet, or a flexible pipe with ear trumpet
thereto Q. At each extremity of the box is placed a terminal G H.
The electric current enters from the line wire by the terminal G, passes along the
wire of both coils and goes to the ground through the terminal H.

page_text: Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, exactly as com-
municated to me by my foreign correspondent, I declare that what I claim is
1st. A telephone having three or more horse shoe magnets, the extremities of
whose branches overlap or cross each other alternately for about twenty milli-
metres and which are connected by two rods or bars of soft iron, each bearing a
bobbin round which fine wire is coiled in the same direction a diaphragm in tin
plate or ferrotype close to the coils. The whole being placed in a wooden box
bearing an ear trumpet or a flexible tube provided with an ear trumpet.
electric current coming from the line and going to ground after traversing the wire
in all its length.
An
2nd. In a telephone such as that described in claim 1 a brass ring bearing the
diaphragm the distance from which to the coils is determined by four pressure
screws.