IMPROVEMENTS IN CALL OR SIGNAL APPLIANCES FOR TELEPHONES AND HOUSE TELEGRAPHS
Year: 1884

page_text: I GERARD WENZESLAUS VON NAWROCKI of 124 Leipzigerstrasse, Berlin in the
Kingdom of Prussia Germany do hereby declare the nature of said invention for
"IMPROVEMENTS IN CALL OR SIGNAL APPLIANCES FOR TELEPHONES AND HOUSE
TELEGRAPHS" (A communication to me from abroad by August Julius Wilhelm
Münch of the City of Berlin in the Kingdom of Prussia Germany) to be as
follows:-
By means of this invention the use of a battery is avoided for call or signal
appliances for telephones and house telegraphs. This is accomplished by the
induction current set up in the coils on the poles of the horseshoe magnet by the
short and rapidly following closing and opening of the same.
strong enough to put an alarum in motion.
These currents are
Below the pole pieces of the horseshoe magnet there is an armature consisting
of a prismatic block of brass which can turn on a centre or spindle and is provided
with a projecting bead of soft iron on two opposite sides at top. which beads form
the armature. These beads form segments of a cylinder and take up the free space
between the two pole pieces which for this purpose are cut out to a circular sweep.
The fulcrum spindle of the brass block bas at one end a small tooth pinion and
has its bearings in plates or pieces fixed to the legs of the horseshoe magnet. This
pinion can be turned quickly by suitable multiplying tooth wheel gear and handlo
or knob, thereby turning the brass block with the armature pieces or beads, the
latter during the rotation passing the pole pieces without touching.
In the position when the armature is against the pole pieces the horseshoe
magnet is short circuited through the pole pieces and armature and the magnetism
in the cores within the coils thereof weakened. When the armature by the rotation
leaves the pole pieces, the horseshoe magnet is opened and the cores receive their
full power corresponding with the magnetic power of the horseshoe. By further
rotation of the armature the horseshoe magnet is closed and then opened and so on.
Each time there a strengthening or weakening of the magnetism of the cores,.
LD C21

page_text: and powerful induction currents set up in the wire coils which produce sounds that
can be heard far in the telephones and also are strong enough to set alarums in
motion on induction current.
The action of the call apparatus depends materially upon the speed of rotation
of the armature block. The call apparatus may be made on so small a scale that
with exception of the handle it may find its place in the envelope of the
telephone.
The whole appliance may be turned 90° round between the legs of the horseshoe
magnet whereby the arrangement of the pole pieces will be slightly altered. The
soft iron armature pieces would in that case reach and leave the pole pieces
simultaneously, hence also consecutively short circuit and open the horseshoe
magnet.
In order to increase the noise produced in the cores by the short circuiting of
the magnet a movable peg may be put in the mouth opening of the telephone,
which peg rests on the metal plate diaphragm and is guided in a cross piece
inserted in the opening.
The vibrations of the metallic diaphragm in consequence of the alternating
attractions of the magnet poles put the peg into an up and down vibrating motion
and the jumping of the peg on the diaphragm produces a loud noise. To the cross
piece may be fastened a bell, in which case the peg in its up and down motion will
strike against the bell and sound it. The position of the bell may be adjusted by
screws. In a "call" or signal for a house telegraph the current produced in the
aforesaid horseshoe magnet coils is by wires led to the bell which is sounded
thereby. The aforesaid pinion on the armature block is turned as before by
multiplying tooth wheel gearing by preference by a sector wheel and pulling
rod and knob, the rod being brought back by a helical spring in the ordinary
manner,
ML

page_text: "
I, GERARD WENZESLAUS VON NAWROCKI of 124 Leipzigerstrasse Berlin in the
Kingdom of Prussia Germany do hereby declare the nature of said Invention for
"IMPROVEMENTS IN CALL OR SIGNAL APPLIANCES FOR TELEPHONES AND HOUSE
TELEGRAPHS (a communication to me from abroad by August Julius Wilhelm
Münch of the City of Berlin in the Kingdom of Prussia Germany) and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
By means of this invention the use of a battery is avoided for call or signal
appliances for telephones and house telegraphs. This is accomplished by the
induction current set up in the coils on the poles of the horse shoe magnet by the
short and rapidly following closing and opening of the same. The currents are
strong enough to put an alarum in motion.
And in order that this invention may be more fully understood I will describe
the same with reference to the accompanying drawings Figure 1 being an end view
Figure 2 a vertical cross section and Figure 3 a plan of a telephone to which the
invention is applied.
Figure 4 is a part sectional elevation of a similarly fitted telephone but with
additional parts, Figure 5 a detail belonging thereto.
Figure 6 is a part-sectional elevation of a "call" or signal appliance for a house
telegraph.
Below the pole pieces BB of the horse shoe magnet A of a telephone Figures 1, 2
and 3 there is an armature consisting of a prismatic block of brass D which can
turn on a centre or spindle and is provided with a projecting bead E E of soft iron
on two opposite sides at top and bottom which beads form the armature. These
beads E form segments of a cylinder and take up the free space between the two
pole pieces B B which for this purpose are cut out to a circular sweep. The fulcrum
spindle of the brass block D has at one end a small tooth pinion H and has its
bearings in plates or pieces M. fixed to the legs of the horseshoe magnet. This pinion
can be turned quickly by suitable multiplying tooth wheel gear such for instance
as F J and K and handle or knob G, thereby turning the brass block D with the
armature pieces or beads E E, the latter during the rotation passing the pole pieces
without touching.
In the position shown at Figure 1 when the armature is against the pole pieces
the horseshoe magnet A A is short circuited through the pole pieces B and armature
E and the magnetism in the cores within the coils C thereof weakened. When the
armature E by the rotation leaves the pole pieces B B, the horse shoe magnet A is
opened and the cores receive their full power corresponding with the magnetic power
of the horse shoe magnet A A. By further rotation of the armature the horseshoe
magnet is closed and then opened and so on. Each time there is a strengthening or
weakening of the magnetism of the cores, and powerful induction currents set up in
the wire coils C which produce sounds that can be heard far in the telephones and
also are strong enough to set alarums in motion on induction currents.
The action of the call apparatus depends materially upon the speed of rotation of
the armature block. The call apparatus may be made on so small a scale that with
exception of the handle G it may find its place in the envelope of the telephone.
The whole appliance may be turned 90° round between the legs of the horseshoe
magnet whereby the arrangement of the pole pieces B will be slightly altered. The
soft iron armature pieces would in that case reach and leave the pole pieces B
simultaneously, hence also consecutively short circuit and open the horseshoe
magnet.

page_text: In order to increase the noise produced in the cores by the short circuiting of the
magnet a movable peg a may as shown in Figure 4 be put in the mouth opening of
the telephone, which peg rests on the metal plate diaphragm b and is guided in a
cross piece c inserted in the opening.
The vibrations of the metallic diaphragm b in consequence of the alternating
attractions of the magnet poles put the peg a into an up and down vibrating motion
and the jumping of the peg on the diaphragm produces a loud noise. To the cross
piece e may be fastened a bell d as shown at Figure 5, in which case the peg a in
its up and down motion will strike against the bell and sound it. The position of
the bell may be adjusted by screws. In a "call" or signal for a house telegraph as
shown at Figure 6 the current produced at the aforesaid horseshoe magnet coils CC
is by wires led to the bell which is sounded thereby. The aforesaid pinion H on
the armature block D is turned as before by multiplying tooth wheel gearing F
and J by preference as here shown by a sector wheel N and pulling rod P and
knob O, the rod being brought back by a helical spring h in the ordinary manner.
The magnet cores are connected by a piece K of soft iron.
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 is:
First In arrangements where in, telephones with horseshoe magnet induction
currents for signalling are produced by short circuiting and opening of the horseshoe
magnet A, the application of the revolving armature E D E between the legs of the
magnet A for the purpose of producing induction currents in the induction coils CC
of the telephone itself, and the utilizing of the telephone leads for conveying the
currents, and the diaphragm b with or without sound increasing appliance sub-
stantially as described with reference to Figures 1, 2, 3, 4 and 5.
Second The application of the fixed magnet, A, the fixed coils CC and the
armature D with soft iron end pieces E E revolving between the pole pieces BB
for signalling in house telegraphs.
,
Dated this Fifteenth day of November 1984