sed in Connection therewith.
Year: 1886

page_text: Date of Application, 4th Mar., 1886.
Complete Left, 6th Dec., 1886.
Complete Accepted, 25th Jan., 1887.
be Used in Connection therewith.
We HANS PETER FREDERIK JENSEN, of 36 Great James Street, Bedford Row in
the County of Middlesex, Engineer, BROWNE WOLSEY WEBB, of 144 Camden Road,
in the County of Middlesex, Electrician, and JENS JENSEN, of 36 Great James Street,
Bedford Row, in the County of Middlesex, Engineer do hereby declare the nature of
this invention to be as follows:-
Our invention relates to electric bells and apparatus to be used in connection
therewith, and comprises various improvements hereinafter set forth.
In the specification of former Letters Patent granted to us 3rd October, A.D. 1882,
No. 4712, we have described electric bells wherein the clapper or hammer and the
armature are secured to each other and suspended within the bell at, or near, the top
thereof. One object of our present invention is to improve the construction andl
increase the efficiency of bells of this kind.
Another object of our said invention is to provide very simple and cheap electric
bells for domestic or other purposes.
Our said invention is applicable to what are known as magneto-bells as well as to
those commonly termed electric bells.
An important feature of our invention is the construction of an electric bell of the
kind described in the said former specification in such a manner that the necessary
contacts will be made by the act of securing the bell to a holder or support such as a
hook or bracket. We are thus enabled to dispense with the wire connections hereto-
fore used with electric bells, the wires or conductors from the electric generator being
arranged in, or connected with, the said holder or support.
We prefer to connect one end of the electro-magnet coil with the dome or body of
the bell and the other end thereof with a bolt or other support for the said magnet and
adjuncts thereof. This bolt or support is insulated from the dome or body of the bell.
The said done or body therefore serves as one terminal and the bolt or support as the
other terminal of the magnet coil. The said dome or body is provided with suitable
137

page_text: means whereby it can be readily secured to, and electrically connected with, its bracket
or holder at one operation, and the said bracket or holder is provided with suitable
means whereby, in this operation, the bolt or other support for the magnet will he
electrically connected with a contact piece carried by, but insulated from, the said
bracket or holder.
We sometimes provide the dome or body of the bell at its upper end with a serew-
threaded socket or projection which fits into or upon a downwardly extending part of
a bracket designed to be attached to a wall or other support in a similar manner to a
gas-bracket. The screw-bolt and nut for fastening the magnet and other parts in the
dome are insulated from the dome by a piece of vulcanite or other suitable material.
The magnet coil is attached at one end to the dome and at its other end to the said bolt
or to the contact spring, according to whether a single-stroke bell or a trembling bell
is to be made. An insulated wire from the electric generator is passed through the
bracket. This wire is attached to a contact piece which is inserted in the bracket and
rests against a seat of india-rubber or other elastic material, so that, when the dome is
screwed into or upon the bracket, the aforesaid screw-bolt will press against the said
contact piece and slightly compress the elastic seat. Good contact is thus ensured
between the said bolt and contact piece. The other wire from the generator is attached
to the bracket and one or other of the said wires is connected with a suitable push-
knob or similar device. Therefore the simple act of attaching the bell to its support
will connect the same with the electric circuit for operating it, and separate wire
connections for this purpose can be dispensed with. Instead of the said bracket we
sometimes use a flat or corrugated spring or a hook provided with means whereby the
act of attaching the bell thereto will make the necessary contacts. Or we make
the bracket in two parts and connect the same by wires with the two poles of the
generator.
When our improved bell is constructed as above described, it can be used as a
trembling bell without the necessity for employing a contact spring, provided the
clapper or hammer be electrically connected with the aforesaid screw-bolt; because
each time the clapper or hammer strikes the dome of the bell, the electro-magnet will
be short circuited. In this case the circuit is not broken, therefore sparking at the
contacts will be avoided. Moreover this arrangement enables electric bells to be
connected in series.
We employ in the said bells one or more electro-magnets. The kind of magnet
which we prefer to use for this purpose has a hollow or tubular core provided at each
end with a metal dise or plate. The armature is parallel, or nearly parallel, with
the axis of the core and coil, and moves in a direction at right angles thereto, or
approximately so. The effects of residual magnetism are greatly diminished by using
a split tube for the core.
We sometimes so form and arrange the armature of our magnet that its throw or
travel will be increased. For this purpose we make the said armature with a projection
which is close to the poles when the armature is unattracted and is therefore within
the magnetic field and which, when the armature is attracted by its magnet, will enter
and move freely in the space between the poles of the said magnet. Or instead of
forming this projection on the armature, we attach a piece of soft iron thereto, or we
bend the said armature so that a portion thereof will extend between the poles of the
magnet.
In some cases we increase the efficiency of the magnet by winding its armature with
insulated wire and magnetizing the said armature.
We sometimes form the screw-bolt for supporting the internal mechanism of the
bell with an extension which is passed through the tubular core of the magnet and is
secured therein in any suitable manner. By this means we simplify the construction
of the bell and increase the strength or efficiency of the magnet by diverting or
conducting the magnetism from the interior of the core to the poles or pole-pieces.
We, in some cases, form the bolt or other support for the electro-magnet in one piece
with the core thereof. And we sometimes use only one pole-piece which is suitably
bent.

page_text: Instead of connecting the armature and clapper or hammer to the dome by means
of a gimbal, we sometimes connect them thereto by a suitable hinge or other joint.
By winding the armature with insulated wire as above described and connecting it
so as to alternate the poles, our invention is peculiarly adapted for magneto-bells.
In some instances we bend the pole-pieces of the magnet so that they extend on
each side of the coil, and use a permanent magnet as the armature. One or more of
these armatures are used and each armature may be provided with a clapper or hammer.
Or we make the said armatures of soft iron and wind them as electro-magnets. In
this case, we sometimes use a permanent magnet with suitable pole-pieces for operating
the said armatures.
In making electric bells for domestic or similar purposes, we sometimes provide
the dome or body of the bell with a loose clapper or hammer and suspend it from a
coiled or other spring, and we arrange one or more electro-magnets connected with an
electric generator and one or more push-knobs or similar devices. We attach an
armature to the dome of the bell or to its supporting spring, so that, when the circuit
is complete the bell and its spring will be caused to vibrate like an ordinary house-bell
actuated by pulling a wire. We, in some instances, convert ordinary house-bells into
electric bells in this manner.
We provide for the automatic ringing or sounding of single-stroke bells by employing
a commutator or contact making and breaking device operated by a spring which can
be wound up like an ordinary watch spring. This spring actuates a click or a pointer
for making and breaking contact. Or we combine our electric bell with a clock and
so arrange the same that the bell will be sounded at pre-determined times.
It is obvious that some of our improvements are applicable to bells differing more
or less in construction from those above described.
HASELTINE, LAKE & CO.,
For the Applicants.

page_text: Improvements in Electric and Magneto Bells, and Apparatus to
be Used in Connection therewith.
We, HANS PETER FREDERIK JENSEN, of 36 Great James Street, Bedford Row,
in the County of Middlesex, Engineer, BROWNE WOLSEY WEBB, of 444. Camden Road,
in the County of Middlesex, Electrician, and JENS JENSEN, of 36 Great James Street,
Bedford Row, in the County of Middlesex, Engineer, 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 :-
Our invention relates to electric and magneto bells, and to apparatus to be used in
connection therewith, and our said invention comprises various improvements herein-
after set forth.
In the Specification of former Letters Patent granted to us and dated 3rd October
A.D. 1882, No. 4712, we havo described electric bells wherein the operative mechanism
is secured within a dome or hollow body similar in shape to the dome or body of an
ordinary house-bell of the kind usually suspended by a coiled spring and operated by
pulling a wire. One object of our present invention is to improve the construction
and increase the efficiency of electric bells of the kind or class above referred to.
Another object of our said invention is to provide very simple and cheap electric
bells for domestic or other purposes.
Our improvements are applicable to what are known as magneto-bells (that is to say,
bells which are operated by currents from dynamo or magneto electric machines) as
well as to those commonly termed electric bells.
In the accompanying drawings,
Figure 1 is a side elevation, partly in vertical central section, showing a bell and a
supporting bracket therefor constructed in accordance with our invention.
Figure 1 is a diagram hereinafter referred to.
Figure 2 is a rear elevation of the said bracket.
Figure 3 is a perspective view showing a modification of our invention.
Figure 4 is a vertical longitudinal central section, showing another modification
thereof.
Figure 4a is a side elevation, partly in vertical central section, showing a further
modification of our invention..
Figure 5 is a perspective view of a bell provided with two hooks whereby it is
supported in a frame as hereinafter set forth.
Figure 6 is a side elevation, partly in vertical section, showing a bell provided with
a loop or eye as hereinafter described.
Figure 7 is a side elevation, and
Figure 8 is a vertical central section, showing one form or modification of the
mechanism employed in our bells.
Figure 9 is a vertical central section, showing a modification of our electric bell
wherein the mechanism is arranged and enclosed between two domes or semispherical
sounding bodies.
Figure 10 is a side elevation, showing another modification of our electric bell
mechanism.

page_text: magnet.
Figure 12 is a side elevation, and
Figure 13 a front elevation showing another arrangement of the magnet.
Figures 14 and 16 are vertical central sections, showing further modifications of our
invention.
Figure 15 is a side elevation of another form or modification of our electric bell.
Figure 17 is a vertical central section of a musical bell constructed according to our
present improvements.
Figures 18 and 19 are side elevations, partly in vertical central section, showing
electric bells constructed according to our presont invention for domestic and similar
purposes.
Like letters indicate corresponding parts throughout the drawings.
An important feature of our invention is the construction of an electric bell of the
kind or class described in the said former specification in such a manner that one or
both of the requisite electrical connections will be effected by the act of placing the
bell upon, or attaching it to, a holder or support, such as a hook or bracket, suitably
connected with an electric generator. We are thus enabled to dispense with any
wires projecting from the bell, the wires or conductors from the electric generator
being arranged in or connected with the said holder or support.
In Figures 1 and 2, a is a metal bracket which is firmly secured to a block or piece b
of wood or other suitable material designed to be attached to a wall or the like in any
convénient manner. The said bracket is connected by a wire e, with one pole of a
battery or other source of electricity, the other pole of which is connected, by a wire el,
with a contact spring d secured in a recess or cavity in the block b. This contact
spring forms, in combination with a contact spring , also secured in the said recess
or cavity, a convenient device for enabling the bell to be rung by means of a bell-pull
or rope e passed through a hole in the block band attached to the contact spring d, as
will be readily understood on reference to the drawing.
fis the dome or body of the bell, which has a loop or eye g firmly attached thereto
or formed integrally therewith. By preference we make the said loop or eye separately
from the dome and secure it thereto as hereinafter set forth. is the electro-magnet,
the core of which is extended upward and is secured in the top of the dome by
means of a nut 12, but which is insulated from the said dome by a piece * of vulcanite
or other suitable material. is the armature and jis the clapper or hammer, these
parts are pivoted at to the core . A is the contact spring of the electric bell. One
end of the magnet coil is in electrical connection with the dome; the other end of
the said coil is connected with the contact spring k, therefore the dome for the loop
or eye thereof serves as one terminal and the core has the other terminal of the circuit
in the bell. The connection of the dome to the battery-circuit is effected by hanging the
bell on the bracket a as shown in Figure 1. The core is connected with the contact
spring in the block by means of a wire h³ secured, at one end, to the said block b
by a binding screw electrically connected with the contact spring d', and held, at
the other end, in contact with the core ¹ by a nut h³. It will, therefore, be seen that
the requisite connections are made by simply hanging the bell on the bracket a and
securing the wire 3 by the nut 5 as above described. Figure 1 is a diagram
shewing the connections between a bell of the kind above described and the battery, a
push-knob being shown included in the circuit.
According to a modification of our invention illustrated in Figure 3, we suspend the
bell from a hook a' connected with an electric generator and we provide a contact
spring m, which is also connected with the said generator, and the free end of which
bears against the core when the bell is suspended from the said hook. It is evident
that, in this case, the placing of the bell on its holder or support, will effect both of the
requisite electrical connections between the bell and the battery. In Figure 3, the
said hook and spring are shewn attached to a shelf supported upon brackets, but they
may, if desired, be attached to any other suitable support.

page_text: In the modification of our invention shewn in Figure 4, the dome ƒ is provided, at its
upper end, with a serew-threaded socket, which fits into a socket a screwed upon
the end of a hollow or tubular bracket designed to be attached to a wall or the like
in a similar manner to a gas-bracket. The core and nut are insulated from the
dome by a piece of vulcanite or other suitable material. The magnet coil is
connected, at one end, with the dome, and, at its other end, with the contact spring k
as above described. An insulated wire e² from the electric generator is passed through
the bracket and is attached to a contact piece arranged within the socket a² in
combination with a seat of india rubber or other elastic material. When the dome
is screwed into the said socket, the extension of the core presses against the said
contact piece and slightly compresses the elastic seat 1. Good contact is thus ensured
between the said core and the piece 7. This elastic seat is not essential to the proper
action of the apparatus; the contact piece 7, may, if desired be secured in a rigid seat.
The other wire 3 from the generator is attached to the bracket in any convenient
manner, and one or other of the said wires is connected with a suitable push-knob or
similar device. The dome may be screwed upon, instead of into, the bracket a³ or
socket a², or it may be otherwise attached thereto. We have shewn the bracket curved
and the bell depending therefrom; if desired, however they may be otherwise arranged.
It will be seen that the simple act of attaching the bell to the bracket will, in this case,
connect the same with the electric circuit for operating it; wires projecting from the
bell for this purpose, can, therefore, be dispensed with. Moreover the bell can be
removed from the bracket without disconnecting any wires. A further advantage
afforded by this modification of our invention is that the contacts are enclosed and
protected against dust and injury, and there are no exposed wires. We sometimes
attach the bell to a socket a² (Figure 4) provided with a flange a whereby it may be
secured to a ceiling or the like; this socket is provided with a contact piece and an
olastic or yielding seat therefor like the bracket shewn in Figure 4.
Instead of a bracket, we sometimes use a flat or corrugated spring, or a hook,
provided with means whereby the act of attaching the bell thereto, or placing it thereon,
will make the necessary contacts. Or we make the bracket in two parts and connect
the same by wires with the two poles of the generator. In the latter case, we provide the
bell with two hooks or eyes wliereby it may be suspended from the bracket or holder.
In the apparatus shewn in Figure 5, the bell is provided with two hooks n, n', which
form the terminals of the circuit in the bell, and the said bell is suspended in a frame
or support o by the engagement of the said hooks with rings or eyes of, of attached to the
said frame or support. The rings or eyes o', o, are connected, by the wires c², c³, with
the electric generator, and one of the said wires is provided with a push-knob or
other device for closing and opening the circuit. The wires c², c³, may, if desired, be
cnclosed within the frame or support o. The weight of the bell is sufficient to keep the
contact surfaces clean and thus ensure good electrical connection between the same.
Morcover the hell can swing very freely.
We have found that, when the loop or eye is cast in one piece with the dome or
body of the bell, the proper vibration of the latter is interfered with or disturbed, so
that the bell gives a deadened sound when struck. Moreover the casting of the dome
and the loop or eye in one piece is a difficult operation. We, therefore, form the
said loop or eye separately from the dome and secure it thereto by screws or otherwise.
For instance, we, in some cases, make the bell, as shown in Figure 6, with a screw-
threaded socket or projection at the top of the dome, and we make the loop or eye g
with a ring or annular piece g' which is screw-threaded internally and fits upon the
said socket. Or we make the said socket or projection and the loop or eye without
screw-threads and provide the said loop or eye with a flange g, as shown in Figure 1;
we then secure the loop or eye to the dome by means of screws g.
We sometimes connect the magnet-coil, in our improved electric bell, directly with
the core instead of through the contact spring k, so that the clapper or hammer will
strike the dome only a single stroke each time the push-knob or bell-pull is operated,
the contact between the clapper and the dome not being sufficient to shunt the current
and short-circuit the magnet.

page_text: When our electric bell is to be used as a trembling bell, we sometimes dispense with
the contact spring, and connect one end of the magnet coil with the donic and the
other end with the core . In this case, we use a spring, as shown, for example, at k²
in Figure 13, so that each time the clapper j strikes the bell, its shank je will make
contact with the said spring. In this modification of our invention, each time the
clapper or hammer strikes the dome of the bell, the current will be shunted through
the spring and the electro-magnet short-circuited and consequently demagnetized,
the clapper will then move out of contact with the dome and with the spring and
the magnet will again be included in the circuit and magnetized, and will cause the
clapper to again strike the dome. In this case, the circuit is not broken, therefore
sparking at the contacts is avoided. Moreover this arrangement enables our electric
bells to be connected in series if desired.
In Figures 7 and 8, we have shown a modification of our invention wherein we
arrange the magnet h horizontally instead of vertically. The core is, in this case,
secured to a forked piece whereby the magnet and the armature and clapper are
secured in the dome; the armature i is made of an inverted T-shape.
In Figure 9 we have shown a modification of our invention wherein we enclose the
mechanism between two domes so that the said mechanism is protected against
dust and injury. The lower dome is secured to the core by means of a screw.
It may, however, be secured thereto in any other convenient manner.
In Figure 10, we have shown a modification of our invention whereby we provide
for increasing the length of stroke or movement of the clapper. In this modification,
the armature is pivotted at 7 and is connected by a link with the shank j* of the
clapper, which is pivotted at j. It will be readily understood, on reference to the
drawing, that the movement imparted to the clapper.j will be greater than that given
to the armature. The magnet is, in this instance, arranged horizontally; it may,
however, be arranged vertically, if desired.
We employ, in our improved electric bell, one or more electro-magnets or an electro-
magnet having one or more coils, as described in our said former specification. For
example, in some instances, we use a magnet having two coils arranged horizontally,
as shown in Figure 11. The cores of the magnets shown in this Figure are secured
to a bar p attached to the dome. This bar has an extension in which is inserted
a binding serew 2 whereby one end of the magnet coil is connected with the said
extension. An adjusting screw pis, moreover, passed through the said extension 50
that the contact spring will bear against the said screw. The other end of the magnet
coil is passed through a hole in the done for connection with the battery-circuit, but
is insulated from the said dome.
This Figure does not illustrate any of our present improvements, the bell shown
therein being constructed substantially as described in our said former specification.
It is merely inserted to show how the magnet may be constructed and arranged in
any of the bells made according to our present invention. In other instances, we
employ a magnet having two coils which are arranged vertically, as shown in
Figures 12 and 13, wherein we have shown electric bell mechanism constructed
substantially as described in our said former specification, with the exception of the
spring hereinbefore referred to. In this mechanism, both pole-pieces are at the
lower end of the magnet and the armature extends horizontally in front of the said
pole-pieces. The armature is, moreover, held away from the pole-pieces by a
spring, which effects the return movement of the said armature after it has been
attracted.
We sometimes use magnets made with hollow or tubular cores provided at either
end with a metal dise or plate or with a pole-piece. The armature is preferably so
arranged that it is parallel, or nearly parallel, with the axis of the core and coil, and
moves in a direction at right angles thereto or approximately so. The effects of
residual magnetism are greatly diminished by using a split tube for the core as
described in our said former specification.
When we employ a magnet with a hollow or tubular core, we provide a screw-bolt
for supporting the mechanism of the bell in the dome. This bolt extends through

page_text: the tubular core of the magnet and is secured therein in any suitable manner. By
this means, we simplify the construction of the bell and increase the strength or
efficiency of the magnet by diverting or conducting the magnetism from the interior
of the core to the poles or pole-pieces.
In the modification of our electric bell shewn in Figure 14, we make the pole-
pieces of the electro-magnet so that they extend on either side of the coil, and we
employ two armatures i, one on each side of the electro-magnet. Each of these
armatures is a permanent magnet; one of the said armatures is placed with its North
pole uppermost and the other armature is placed with its South pole uppermost. A
head or knob jis attached to each armature, so that it will serve as a clapper or
hammer. This form of bell is very advantageous for use with an alternating current
machine.
ין
We sometimes attach our improved electric hell to a base or stand, as shewn, for
example, at in Figure 15, so that it may rest upon a table or the like. In this case,
we provide the bell with a pin or rod fitted to slide vertically in the loop or eye gand
held up by a spring which bears at its lower end against a cross-bar³ formed on
the eye . The said pin or rod is connected with one of the wires from the electric
generator, the core or terminal being connected with the other wire therefrom.
By pressing down the said pin or rod, contact may be readily made between the same
and the core or terminal 7, thus closing the circuit and ringing the bell. The said
pin or rod and its spring may, if desired, be otherwise suitably arranged.
In some instances, we attach a disc or indicators to the armature, as shown in
Figure 16, for example; so that, after the bell has been rung and the circuit broken,
the said armature and disc will continue to vibrate and thus indicate which bell of a
series has been rung.
In Figure 16, we have also shown a modification of our invention wherein the
armature is suspended at a point on one side of the core, and is provided with a head
or knob so that it will also serve as a clapper or hammer. The armature is shewn
suspended by a spring secured to the domef but insulated therefrom; if desired,
however, it may be suspended by means of a hinge-joint, as shown, for example, in
Figure 10.
When our bells are to be used for musical purposes, we prefer to connect one end of
the magnet coil with the dome and the other end thereof directly with the core /¹
instead of through a contact spring, so that the bell will only be struck once each time
the circuit is closed by the push-knob or similar device. Moreover we prefer to provide
the armature with a damper, which, when the circuit is open, will rest in contact with
the dome and thus prevent vibration thereof. An example of this is shewn Figure 17,
wherein the damper is carried by a spring t attached to the armature i.
We sometimes so form and arrange the armature of the magnet that its throw or
travel will be increased. For this purpose we make the said armature with a projection
which is close to the poles when the armature is unattracted, and is, therefore, within
the magnetic field, and which, when the armature is attracted by its magnet, will enter
and move freely in the space between the poles or polar extensions of the said magnet,
and thus permit the other parts of the armature to enter the magnetic field. Or, instead
of forming this projection on the armature, we attach a piece of soft iron thereto, or we
bend the said armature so that a portion thereof will enter and move freely in the space
between the poles of the magnet for the purpose above specified.
In some instances, we use only one pole-piece, which is suitably formed and is so
arranged that it forms one pole of the magnet.
We sometimes increase the efficiency of the mechanism by winding the armature or
armatures with insulated wire and magnetizing the same.
By thus winding the armature with insulated wire and connecting it so as to
alternate the poles, our bell is adapted for operation by an alternating current such as
that from a dynamo or magneto electric machine.
In some instances, we make the pole-pieces of the magnet so that they extend
beyond the coil on one side thereof, and use a permanent magnet as the armature.
One or more of these armatures are used and each armature may be provided with a

page_text: clapper or hammer. Or we use armatures of soft iron wound as electro-magnets and
use a permanent magnet with suitable pole-pieces for operating the said armatures.
In making electric bells for domestic or similar purposes, we sometimes provide the
dome or body of the bell with a clapper or hammer suspended within the same, and we
suspend the said dome by a coiled spring or otherwise and arrange in combination
therewith an electro-magnet connected with an electric generator and with a push-knob
or similar device. Or we wind the spring or its equivalent so that it forms the core of
an electro-magnet, and arrange the same in combination with a fixed armature.
In Figure 18, we have shewn a bell the dome or body of which is attached to the
lower end of a bent rod or bar i which serves as the armature of the magnet h, and
which is suspended by a spring a from a bracket or support v designed to be secured
by screws or otherwise to a wall or the like. The magnet h is also attached to the said
bracket or support and is to be connected in any convenient manner with an electric
generator and with a push-knob or similar device. A clapper or hammer j³ is pivotted
within the dome. We prefer to make this clapper of an inverted T-shape as shewn,
so that a very short movement in either direction will cause it to strike the said dome.
When the circuit is completed by means of the push-knob or other device, the bell will
he caused to vibrate or swing and ring like an ordinary house-bell actuated by pulling
a wire. We, in some instances, convert ordinary house-bells into electric bells in this
manner.
In Figure 19 we have shown a modification wherein the rod or bar i is connected
with the bracket by means of a hinge-joint w so that the dome is free to swing upon
or about the said joint.
According to another modification of our invention, we provide for the automatic
ringing or sounding of single stroke bells at regular or irregular intervals for any
desired length of time. For this purpose we employ a commutator or contact making
and breaking device operated by a spring which can be wound up like an ordinary
watch-spring. This device is constructed with a ring or annular piece provided with
a series of projections or contact pieces and connected with one of the wires from an
electric generator. A metal hand or pointer is fixed upon a shaft which is concentric
with the said ring and is connected with the other wire from the said generator. A
coiled spring is combined with the said shaft and with the hand or pointer, and
suitable means are provided whereby the said spring may be wound up, and whereby
the speed of unwinding thereof may be regulated. In the unwinding of the spring,
the hand or pointer is carried around by the said spring and thus caused to come in
contact successively with the said projections or contact pieces. The circuit is thus
alternately closed and opened at regular or irregular intervals according to the
arrangement of the said contact pieces. In this case, we prefer to use a single stroke
bell. We sometimes combine our electric bell with a clock and so arrange the same
that the bell will be sounded at regular or irregular intervals or at predetermined
times. This part of our invention is more particularly advantageous for use in
churches, factories or other places where a bell is required to be rung for a
considerable time.
In some instances, we combine, with the armature and clapper or hammer, a tube
containing mercury and having conducting wires inserted therein in such a manner
that the circuit will be closed and opened by the mercury when moved from end to
end of the tube during the vibration of the armature and clapper. Or we arrange
this device in such a manner that the mercury, in moving to and fro, will shunt the
current and thus alternately short-circuit the magnet and include it in the circuit.
We do not confine ourselves to the details of construction hereinbefore described,
as they may be somewhat modified without departing from the nature of our invention.
For example, the dome, the armature, the clapper or hammer, the magnet and other
parts may be arranged in any other suitable manner so that the dome and the part
which supports the inechanisin therein will serve as terminals for the purpose above
specified. The shape of the bracket or holder may be modified according to the
purpose for which it is required.

page_text: Moreover it is obvious that some of our improvements are applicable to bells
differing in construction from those of the kind or class above described.
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 :
First. An electric bell which is so constructed that the dome or body of the bell
(or the loop or eye thereof) and the part which supports the mechanism therein will
serve as terminals for the purpose above specified.
Second. A bracket or holder for an electric bell, designed to be connected with an
electric generator and provided with means whereby one or both of the requisite
electrical connections with the bell will be effected by the act of placing the bell upon,
or attaching it to, the said bracket or holder.
Third. The combination of an electric bell, a bracket or holder therefor connected
with a source of electricity, and means whereby one or both of the requisite electrical
connections will be effected by the act of placing the bell upon, or attaching it to,
the said bracket or holder.
Fourth. The modification of our invention which consists in providing the bracket
or holder with a device, substantially as above described, for closing the circuit by
means of a bell-pull, as, and for the purpose, specified.
Fifth. A tubular bracket or holder for an electric bell, designed to be connected
with an electric generator and having an insulated wire or conductor arranged within
the same in combination with a contact-piece (with or without an elastic or yielding
seat for the said contact-piece), all substantially as, and for the purposes, set forth.
Sixth. An electric bell the dome or body of which is provided with a screw-
threaded projection or socket whereby it may be secured in or upon a tubular
bracket, substantially as set forth.
Seventh. The combination, with the dome or body of a bell, of a loop or eye fitted
upon a projection or socket at the top thereof, and secured thereto, substantially as,
and for the purpose, set forth.
Eighth. The modification of our invention wherein we provide for effecting one of
the connections between the hell and the electric generator by means of a contact
spring attached to the bracket or support, substantially as described with reference
to Figure 3 of the drawings.
Ninth. An electric bell having two hooks or eyes secured in the dome or body
thereof and connected with the ends of the magnet coil or coils, substantially as
described with reference to Figure 5 of the drawings for the purpose specified.
Tenth. The combination, with an electric bell wherein the operating mechanism is
arranged within the dome and secured at or near the top thereof, of a plate or disc
for closing the open end of the dome, substantially as, and for the purpose, set forth.
Eleventh. An electric bell wherein the operating mechanism is enclosed between
two domes or sounding portions, substantially as described with reference to Figure 9
of the drawings.
Twelfth. The modification of our invention wherein we provide for increasing the
length of stroke or movement of the clapper or hammer as compared with that of the
armature, substantially as described with reference to Figure 10 of the drawings.
Thirteenth. The modification of our invention wherein we employ two perimanent
magnets as the armatures in combination with one or more electro-magnets
substantially as described with reference to Figure 14 of the drawings for the purpose
specified.
Fourteenth. The modification of our invention wherein we attach our electric bell
to a suitable base and provide it with a push-pieee, substantially as described with
reference to Figure 15 of the drawings for the purpose specified.
Fifteenth. The modification of our invention which consists in providing the clapper
or the armature with an indicating disc, substantially as described with reference to
Figure 16 of the drawings for the purpose specified.
Sixteenth. The modification of our electric bell which consists in providing the

page_text: armature with a damper substantially as described with reference to Figure 17 of the
drawings for the purpose specified.
Seventeenth. The employment in an electric bell of one or more armatures which are
wound with insulated wire like electro-magnets and are combined with an electro-
magnet or a permanent magnet, substantially as, and for the purposes, set forth.
Eighteenth. The modification of our invention wherein we provide the magnet with
only one pole-piece or polar extension and make the armature serve as the other pole-
piece or polar extension, substantially as set forth.
Nineteenth. The modification of our invention whereby we provide for short-
circuiting the magnet instead of opening or breaking the circuit, substantially as, and
for the purpose, set forth.
Twentieth. The modification of our electric bell wherein we employ a magnet having
a hollow core, and wherein the part which supports the mechanism in the dome is
passed through, and secured in, the said core, substantially as, and for the purposes,
set forth.
Twenty-first. The combination, with an electro-magnet, of an armature provided
with a projection which, when the said armature is attracted by the magnet, will enter
and move freely in the space between the poles or polar extensions of the said magnet,
substantially as, and for the purpose, set forth.
Twenty-second. The combination, with the dome or body of a bell having a clapper
or hammer suspended therein, of means for imparting vibratory motion to the said
dome or body by the aid of electricity, for the purpose above specified.
source of
Twenty-third. The combination, with a bell suspended by a spring or equivalent
device and having a clapper or hammer suspended therein, of an armature attached to
the said spring or its equivalent, an electro-magnet connected with a
electricity, and a push-knob or the like, substantially as, and for the purpose, set forth.
Twenty-fourth. The combination with the dome or body of a bell of a T-shaped
clapper or hammer, substantially as and for the purpose, set forth.
Twenty-fifth. The modification of our invention wherein we suspend the armature
at a point on one side of the magnet-core and attach the clapper to the said armature,
substantially as described with reference to Figure 10 or to Figure 16 of the drawings.
Twenty-sixth. The combination, with an electric bell, of means for automatically
ringing the said bell at regular or irregular intervals, substantially as, and for the
purpose, set forth.
Twenty-seventh. The improved apparatus consisting of the parts constructed and
combined substantially as described with reference to Figures 1 and 2, or to Figure 4,
or to Figure 4*, or to Figure 5 of the drawings for the purposes specified.
HANS PETER FRED. JENSEN.
Haseltine, Lake & Co.,
45, Southampton Buildings, London,
Agents for the Applicants.