with Electric Bells, and for other Purposes.
Year: 1884

page_text: with Electric Bells, and for other Purposes.
We, GEORGE HENRY JENNINGS, and SIDNEY JENNINGS Sanitary Engineers,
and EDWARD GRIMSTONE BREWER Electrician all of Palace Wharf Stangate:
Lambeth S.E. do hereby declare the nature of our invention for "IMPROVEMENTS
IN INDICATING APPARATUS TO BE USED IN CONNECTION WITH ELECTRIC BELLS
AND FOR OTHER PURPOSES" to be as follows:-
This Invention has for its object improvements in indicating apparatus to be
used in connection with electric bells and for other purposes.
Our improved électric indicator as we prefer to construct it consists of an iron
base plate of starlike form and having as many rays as there are indications to be
given, that is to say, if for example the indicator be required to show from which
of twelve different rooms a. bell has been rung the plate will be provided with
twelve rays. Upon each ray an iron pole piece is fixed and upon each pole piece
are two coils of insulated wire. These coils are wound in opposite directions so
that opposite polarities are imparted to the pole piece according as the electric
current is passed through one or other of the two coils upon it.
In the centre of the group of pole pieces is a pivot carrying a magnetized bar
which is free to revolve in front of the pole pieces and to take up a position
dependent on the attractions and repulsions which any of these pole pieces exert.
Around one half of the circumference of the indicator there is also on the top of
cach pole piece a small armature mounted upon pivots-pivots are fixed on the
top of the bobbin.
Each armature is provided with an arm; its position is such that when the
armature is not attracted by the pole piece the magnet bar is free to swing past it;
but when the armature and the magnet bar are attracted in consequence of a
current passing in one or other of the coils on the pole piece the stop on the
armature is drawn down to such a position as to arrest the magnet bar and cause
it to stop dead when it has swung round to the pole piece.
The pivoted magnet bar carries a card on which the desired indications are
written, the numbers or names of the several rooms or the like.
In front of this dial card is a screen with an aperture in it through which one
only of the several indications can be read viz that which by the movement of the
magnet bar has been brought to coincide with the aperture:

page_text: The bell circuits may be traced from one of the battery poles to each of the
several push buttons. in the various rooms to be served; thence from the push
button in any room through two of the indication coils and so by a common return
wire through a relay to the other pole of the battery. The relay serves to close a
separate bell circuit-The two coils through which the circuit is thus traced. from
any push button are on pole pieces diametrically opposite to each other and the
coils are wound in opposite directions so that the passage of the current causes one
pole piece to assume a north polarity and the other a south polarity. The pivoted
magnet bar is thereby caused to align itself with these pole pieces and it is stopped
in position by the stop on the armature of one of them as already described.
If now the current be traced from another push button it will be found to pass
through the other coils on the same pole pieces-hence when this push button is
used to close the circuit magnetism is excited in the same pole pieces as before but
the polarity is different. The pivoted magnet bar then again aligns itself with
these pole pieces but the bar is reversed end for end having rotated through an
angle of 180 degrees. Thus it will be seen that if the indicator be provided with
twelve pole pieces the bar can be caused to assume twelve different positions.
Where a larger number of indications is required we use a double apparatus and
place the two dials side by side and we provide in connection with them an
appliance by which the apertures in the screens through which the indications are
read are uncovered-except when an indication is being made on this indicator.
This we effect by means of a needle and magnet coil through which the current
passes when the circuit of either indicator is completed-but the current passes in
opposite directions so that the needle takes different positions according as one or
other of the two indicators is in use. The needle is provided with a pair of wings
and in each position a wing covers the aperture of one indicator whilst the other
is left open. By the open aperture the indication is read and no mistake can be
made as no indication is visible on the indicator which is not for the moment
in use.
Dated this 17th day of December 1884.

page_text: Improvements in Indicating Apparatus to be Used in Connection
with Electric Bells, and for other Purposes.
We GEORGE HENRY JENNINGS and SIDNEY JENNINGS Sanitary Engineers
and EDWARD GRIMSTONE BREWER Electrician all of Palace Wharf, Stangate,
Lambeth S.E. 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:-
This Invention has for its object improvements in indicating apparatus to be
used in connection with electric bells and for other purposes.
Our improved electric indicator as we prefer to construct it consists of an iron
base plate of starlike form and having as many rays as there are indications to be
given, that is to say, if for example the indicator be required to show from which
of twelve different rooms a bell lias been rung the plate will be provided with
twelve rays.
Upon each ray an iron pole piece is fixed and upon each pole piece are two coils
of insulated wire. These coils are wound in opposite directions so that opposite
polarities are imparted to the pole pieces according as the electric current is passed
through one or other of the two coils upon it..
In the centre of the group of pole pieces is a pivot carrying a magnetized bar
which is free to revolve in front of the pole pieces and to take up a position
dependent on the attractions and repulsions which any of these pole pieces exert.
Around one half of the circumference of the indicator there is also on the top of
each pole piece a small armature mounted upon pivots. The pivots are fixed on
the top of the bobbin.
Each armature is provided with an arm; its position is such that when the
armature is not attracted by the pole piece the magnet bar is free to swing past
it; but when the armature and the magnet bar are attracted in consequence of a
current passing in one or other of the coils on the pole piece the stop on the
armature is drawn down to such a position as to arrest the magnet bar and cause
it to stop dead when it has swung round to the pole piece.
+
The pivotted magnet bar carries a card on which the desired indications are
written the numbers or names of the several rooms or the like.
In front of this dial card is a screen with an aperture in it through which one
only of the several indications can be read viz that which by the movement of the
magnet bar has been brought to coincide with the aperture."
The bell circuits may be traced from one of the battery poles to each of the
several push buttons in the various rooms to be served; thence from the push
button in any room through two of the indication coils and so by a common
return wire through a relay to the other pole of the battery. The relay serves to
close a separate bell circuit. The two coils through which the circuit is thus
traced from any push button are on pole picces diametrically opposite to each
other and the coils are wound in opposite directions so that the passage of the
current causes one pole piece to assume a North polarity and the other a South

page_text: .
polarity. The pivotted magnet bar is thereby caused to align itself with these
pole pieces and it is stopped in position by the stop on the armature of one of
them as already described.
If now the current be traced from another push button it will be found to pass
through the other coils on the same pole pieces-hence when this push button is
used to close the circuit magnetism is excited in the same pole pieces as before but
the polarity is different.. The pivotted magnet bar then again aligns itself with
these pole pieces but the bar is reversed end for end having rotated through an
angle of 180 degrees. Thus it will be seen that if the indicator be provided with
twelve pole pieces the bar can be caused to assume twelve different positions.
Where a larger number of indications is required we use a double apparatus and
place the two dials side by side and we provide in connection with them an
appliance by which the apertures in the screens through which the indications are
read are uncovered-except when an indication is being made on this indicator.
This we effect by means of a needle and magnet coil through which the current
passes when the circuit of either indicator is completed-but the current passes in
opposite directions so that the needle takes different positions according as one or
other of the two indicators is in use. The needle is provided with a pair of wings
and in each position a wing covers the aperture of one indicator whilst the other
is left open. By the open aperture the indication is read and no mistake can be
made as no indication is visible on the indicator which is not for the moment
in use.
Figure 1 of the drawings hereunto annexed shews a diagram face view of an
apparatus arranged as above described with the indicating card and screen
removed.
Figure 2 is a diagram view of the circuit arrangement Figure 3 is a cross
section through the circle of iron pole pieces.
A are the iron pole pieces ranged in a circle and projecting out from the iron
base plate B-twelve iron pole pieces are shewn but a greater or lesser number
.might be used.
C is the central pivot carrying a magnetized bar D-E (Figure 3) is a circular
indicating card carried by the pivot. F is a fixed screen with an aperture in it
behind which any one or other of the several indications on the indicator card can
be brought.
GG are screw couplings for connecting one end of the wires on the bobbins
which surround the pole pieces with the wires which pass to the various rooms.
The other end of all the wires on the bobbins are connected to one end of the wire
in the bobbin of the magnetic relay H used for closing the circuit of another
battery for ringing a bell.
'
In Figure 21 I are push buttons in various rooms, and K a battery.
In Figures 1 and 3 we have only shewn two wires connected to the two wire
coils which surround two of the iron pole pieces A. but it will be understood that
each pair of pole pieces is similarly surrounded with two wire coils and that one
end of each coil is coupled to a wire leading to a separate room or part of a
building by one of the screw couplings G. L. L. are pivotted armatures in front
of one half of the pole pieces-the weight of the armatures keeps them away from
the pole pieces whenever a current is not passing through either of the wire coils
which surround them. Each armature has a pin M projecting from it. When the
armatures are away from the pole pieces in the position shown in Figure 3, the
pins M which they carry are out of the way of radial arms N which extend from
the pivot C-but-whenever a current passes through the coils which surround any
one or other pair of pole pieces the armature in front of one of these pole pieces is
attracted and the pin M which it carries brought into a position for the radial
arm N to strike against the needle therefore will be brought to rest in a line
passing from one of the pairs of cores to the other and the required signal will be
exhibited through the aperture of the fixed front screen of the apparatus. The
magnet D carried by the pivot. C may either be a plain bar magnet as shown in

page_text: the drawing or it may if desired be surrounded by insulated coils through which
the current is made to pass whenever the bell is rung. In this case the pivot
would have to be divided into two parts insulated from one another so that the
current might be led to one end of the pivot then through the insulated coils
surrounding the bar and out through the other end of the pivot.
The indicating apparatus above described may be used with speaking tube
mechanism such as is described in the specification of a patent granted to one of
us and the late George Jennings N° 4887 in the year 1880 in which an electric
current passes whenever any one or other of the mouth pieces on any one or other
of the branches of such tubes is taken down so that it inay be spoken through.
In this case the armatures L and pins M which they carry may be done away with
because as a current is passing all the time that any person is desirous of speaking
through the tube the indicator card of the indicator mechanism will by the action
of this current be held in position to indicate which branch of the speaking tube it
is that is being spoken through-during the whole time that the mouth piece of
that branch of the tube is being held in position for speaking through. When no
current is passing the card might be made always to return to one normal position
by a light weight attached to it.
When the apparatus is required to be able to give a greater number of signals
than can conveniently be given by a single circle of pole pieces as above described,
then as above stated we use two such mechanisms side by side and provide a
screen at each end of a rocking lever so that when the lever is rocked into one
position one screen will be in front of and close the aperture of the front screen of
one mechanism and when rocked into the other position will close the aperture of
the front screen of the other mechanism.
The arrangement for rocking the lever is shewn at Figure 4.
In this Figure A is the lever carrying the two screens B. C is a curved bar
magnet fixed on the axis of the lever. D are coils of insulated wire around a fixed
iron core-one coil in connection with the wires of one indicator mechanism and the
other with the wires of the other and the coils wound in opposite directions around.
the core so that when a current passes through one of them one curved arm of the
maguet bar will be attracted to the coil and when it passes through the other, the
other curved arm will be attracted and rock the lever over into its other position.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is
1. The combination of indicator mechanism substantially as herein before
described and illustrated in the drawing annexed.
2. The combination of the pairs of magnet pole pieces ranged in a circle and
each surrounded by two insulated wire coils wound in opposite directions, through
any one or other of which an electric current can be passed and a magnet bar on
a central pivot carrying an indicator card or other indicator to indicate into which
position the magnet is moved whenever a current passes through any one or other
of the coils.
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